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anonymous

  • one year ago

help!

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  1. anonymous
    • one year ago
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    The number of chips of different colors in Fran's bag is shown below: 9 red chips 4 green chips 15 yellow chips Fran takes out a chip from the bag randomly without looking. He replaces the chip and then takes out another chip from the bag. What is the probability that Fran takes out a green chip in both draws? 4 over 28 multiplied by 4 over 28 equal to 16 over 784 4 over 28 plus 4 over 28 equal to 8 over 56 4 over 28 multiplied by 3 over 27 equal to 12 over 756 4 over 28 plus 3 over 27 equal to 192 over 756

  2. anonymous
    • one year ago
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    @Vocaloid

  3. Vocaloid
    • one year ago
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    number of green chips/number of total chips = ?

  4. anonymous
    • one year ago
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    i dont get it

  5. Vocaloid
    • one year ago
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    number of green chips = ?

  6. anonymous
    • one year ago
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    4

  7. Vocaloid
    • one year ago
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    total number of chips = ?

  8. anonymous
    • one year ago
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    4

  9. Vocaloid
    • one year ago
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    read the problem again.... how many chips are there in total?

  10. Vocaloid
    • one year ago
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    add all the colors together...

  11. anonymous
    • one year ago
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    oh, 28

  12. Vocaloid
    • one year ago
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    right, so number of green chips/number of total chips = ?

  13. anonymous
    • one year ago
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    4/28

  14. Vocaloid
    • one year ago
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    right. since he picks out two chips (with replacement) we multiply: (4/28)*(4/28) = ?

  15. anonymous
    • one year ago
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    0.02040816326

  16. Vocaloid
    • one year ago
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    as a fraction, please...

  17. anonymous
    • one year ago
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    ok

  18. anonymous
    • one year ago
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    1/49

  19. Vocaloid
    • one year ago
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    don't reduce the fraction 4*4 = ?

  20. anonymous
    • one year ago
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    16

  21. Vocaloid
    • one year ago
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    right, and 28*28 = ?

  22. anonymous
    • one year ago
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    784

  23. Vocaloid
    • one year ago
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    right, so (4/28)*(4/28) = 16/784, so our answer is...?

  24. anonymous
    • one year ago
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    A!

  25. Vocaloid
    • one year ago
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    right

  26. anonymous
    • one year ago
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    ok next

  27. anonymous
    • one year ago
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    Amelia rolls two fair number cubes numbered from 1 to 6. She first defines the sample space as shown below: (1, 1), (1, 2), (1, 3), (1, 4), (1, 5), (1, 6) (2, 1), (2, 2), (2, 3), (2, 4), (2, 5), (2, 6) (3, 1), (3, 2), (3, 3), (3, 4), (3, 5), (3, 6) (4, 1), (4, 2), (4, 3), (4, 4), (4, 5), (4, 6) (5, 1), (5, 2), (5, 3), (5, 4), (5, 5), (5, 6) (6, 1), (6, 2), (6, 3), (6, 4), (6, 5), (6, 6) Based on the sample space, what is the probability of getting a total of 4? 6 over 36 5 over 36 4 over 36 3 over 36

  28. Vocaloid
    • one year ago
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    look at each of the ordered pairs, and count how many add up to 4

  29. anonymous
    • one year ago
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    what do u mean?

  30. Vocaloid
    • one year ago
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    ok, the first pair is (1,1), and 1+1 = 2, right? this doesn't add up to 4, so we ignore it and go to the next one, (1,2)...

  31. anonymous
    • one year ago
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    ok

  32. Vocaloid
    • one year ago
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    keep following the pattern and see how many pairs add up to 4

  33. anonymous
    • one year ago
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    (1,3) = 4

  34. Vocaloid
    • one year ago
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    right, keep going...

  35. anonymous
    • one year ago
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    (2,2) and (3,1)

  36. Vocaloid
    • one year ago
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    right, so we have 3 pairs out of 36, so our answer is 3/36

  37. anonymous
    • one year ago
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    oh okay! next!

  38. Vocaloid
    • one year ago
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    how many are there??

  39. anonymous
    • one year ago
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    like 10

  40. anonymous
    • one year ago
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    but they are quick ones :)

  41. anonymous
    • one year ago
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    There are 5 cards with a picture of a rose and 3 cards with a picture of a daisy. Alia keeps all the cards down on a table with the pictures hidden and mixes them up. She then turns over one card and finds the picture of a rose on it. She removes this card from the table and turns over another card without looking. What is the probability that the card that Alia turns over has a rose on it? 4 over 7 5 over 8 5 over 7 4 over 5

  42. Vocaloid
    • one year ago
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    how many roses does she begin with?

  43. anonymous
    • one year ago
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    um, 1

  44. Vocaloid
    • one year ago
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    read the problem again... how many roses are there at the beginning?

  45. anonymous
    • one year ago
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    5

  46. Vocaloid
    • one year ago
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    ok, after one gets taken away, how many are left?

  47. anonymous
    • one year ago
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    3

  48. Vocaloid
    • one year ago
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    no, please try again... there are 5 to begin with, one gets taken away, how many are left?

  49. anonymous
    • one year ago
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    4

  50. Vocaloid
    • one year ago
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    right... now, let's read the problem again. how many total cards are there at the begining?

  51. anonymous
    • one year ago
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    5

  52. Vocaloid
    • one year ago
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    total cards = roses + daisies = ?

  53. anonymous
    • one year ago
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    8

  54. Vocaloid
    • one year ago
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    right, so we start with 8, then we take one away, how many are left?

  55. anonymous
    • one year ago
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    7

  56. Vocaloid
    • one year ago
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    right, so our probability of getting a rose again is 4/7

  57. anonymous
    • one year ago
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    ok so A?

  58. Vocaloid
    • one year ago
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    yes

  59. anonymous
    • one year ago
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    ok next!

  60. anonymous
    • one year ago
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    Kate is playing a game at the school carnival. There is a box of marbles, and each box has a white, a green, a blue, and an orange marble. There is also a fair 2-sided coin. How many outcomes are in the sample space for pulling a marble out of the box and tossing the coin? 16 8 6 12

  61. Vocaloid
    • one year ago
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    (number of colors)*(number of sides on a coin) = ?

  62. anonymous
    • one year ago
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    what are the number of colors and number of sides on a coin

  63. Vocaloid
    • one year ago
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    read the problem...

  64. anonymous
    • one year ago
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    um 4 colors and 2 coins?

  65. Vocaloid
    • one year ago
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    right, so (number of colors)*(number of sides on a coin) = ?

  66. anonymous
    • one year ago
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    8

  67. Vocaloid
    • one year ago
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    right.

  68. anonymous
    • one year ago
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    ok next!

  69. anonymous
    • one year ago
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    The table below shows the number of shirts of different colors in a closet: Color of Shirt Number Red 1 Blue 6 Green 1 Pink 4 A coin Dennis selects a shirt from the closet randomly without looking. What is the probability that Dennis will select a pink shirt and the coin will land tails up? 5 over 6 3 over 6 4 over 24 2 over 24

  70. Vocaloid
    • one year ago
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    (number of pink shirts)/(total number of shirts) = ?

  71. anonymous
    • one year ago
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    48

  72. Vocaloid
    • one year ago
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    / means divide...

  73. Vocaloid
    • one year ago
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    (4/12)*(1/2) = ?

  74. anonymous
    • one year ago
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    1/3

  75. Vocaloid
    • one year ago
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    let's leave it as 4/12 for now (4/12)*(1/2) = ?

  76. anonymous
    • one year ago
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    1/6

  77. Vocaloid
    • one year ago
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    let's not simplify the fractions, ok? 4*1 = ?

  78. anonymous
    • one year ago
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    4

  79. Vocaloid
    • one year ago
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    and 12*2 = ?

  80. anonymous
    • one year ago
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    24

  81. Vocaloid
    • one year ago
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    right, so (4/12)*(1/2) = 4/24

  82. anonymous
    • one year ago
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    ok Amy makes the following statement: "There is a 60% chance of snow tomorrow and a 10% chance I will be late for school." What is the probability that it will snow and Amy will be late for school? 3% 6% 50% 70%

  83. Vocaloid
    • one year ago
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    multiply the two probabilities together

  84. Vocaloid
    • one year ago
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    (0.6)*(0.1) = ?

  85. anonymous
    • one year ago
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    0.7

  86. Vocaloid
    • one year ago
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    * means multiply...

  87. Vocaloid
    • one year ago
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    (0.6)*(0.1) = ?

  88. anonymous
    • one year ago
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    0.6

  89. Vocaloid
    • one year ago
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    no, please try again... what is 0.6 times 0.1? use a calculator if you are not sure...

  90. anonymous
    • one year ago
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    0.06

  91. Vocaloid
    • one year ago
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    right, now convert that to a percentage by multiplying by 100 0.06*100 = ?

  92. anonymous
    • one year ago
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    6

  93. Vocaloid
    • one year ago
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    right, so our final answer is 6%

  94. anonymous
    • one year ago
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    ok next! The table below shows the number of marbles of different colors in a bag: Color of Marbles Number of Marbles Pink 5 Blue 2 Green 3 Ursula draws a marble from the bag randomly without looking. She then draws another marble from the bag without replacing the first one. Which expression shows the probability of drawing green marbles in both the trials? 3 over 10 multiplied by 2 over 9 3 over 10 multiplied by 2 over 10 3 over 10 added to 2 over 9 3 over 10 added to 2 over 10

  95. Vocaloid
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    (number of green marbles) / (number of total marbles) = ?

  96. anonymous
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    3/10

  97. Vocaloid
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    right... that's the first marble. now, we started with 3 green ones, how many are left after we take one away?

  98. anonymous
    • one year ago
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    2

  99. Vocaloid
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    right. now, we started off with 10 total marbles, how many are left after we take one away?

  100. anonymous
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    9

  101. Vocaloid
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    so our final answer is (3/10)*(2/9)...

  102. anonymous
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    6/90

  103. Vocaloid
    • one year ago
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    read the answer choices...

  104. anonymous
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    oh ok! next! Joy is giving ice cream cones to some children at a carnival. She has 8 chocolate ice cream cones, 10 vanilla ice cream cones, and 6 strawberry ice cream cones. If Joy selects an ice cream cone randomly without looking, what is the probability that she will give a chocolate ice cream cone to the first child and then a vanilla ice cream cone to the second child? 8 over 24 plus 10 over 24 is equal to 18 over 24 8 over 24 plus 10 over 23 is equal to 424 over 552 8 over 24 multiplied by 10 over 23 is equal to 80 over 552 8 over 24 multiplied by 10 over 24 is equal to 80 over 576

  105. Vocaloid
    • one year ago
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    this is almost the same problem as the last one, just with different numbers... can you try this one yourself?

  106. anonymous
    • one year ago
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    no, i need you to help me :)

  107. Vocaloid
    • one year ago
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    read over the other problem again and try this one yourself...

  108. Vocaloid
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    it's literally the same thing all over again

  109. anonymous
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    :(

  110. Vocaloid
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    (number of chocolates)/(total) = ?

  111. anonymous
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    8/24

  112. Vocaloid
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    right, and (vanillas)/(total - 1) = ?

  113. anonymous
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    10/23

  114. Vocaloid
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    right, so multiply them together like we've always done

  115. anonymous
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    80/552

  116. anonymous
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    next! Winnie used a probability simulator to roll a 6-sided number cube and flip a coin 100 times. The results are shown in the tables below: Number on the Cube Number of Times Rolled 1 18 2 25 3 12 4 28 5 7 6 10 Heads Tails 44 56 Using Winnie's simulation, what is the probability of rolling a 4 on the number cube and the coin landing heads up? 16 over 100 72 over 100 1232 over 10000 2432 over 10000

  117. Vocaloid
    • one year ago
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    alright, probability of rolling 4 = ?

  118. anonymous
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    28

  119. Vocaloid
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    probability of rolling 4 = (number of 4's)/(total) = ?

  120. anonymous
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    how do i get that answer?

  121. Vocaloid
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    how many total times was the number cube rolled?

  122. anonymous
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    100

  123. Vocaloid
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    and how many times was 4 rolled?

  124. anonymous
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    1

  125. Vocaloid
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    read the problem again...

  126. Vocaloid
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    how many times was 4 rolled?

  127. anonymous
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    28

  128. Vocaloid
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    right, so probability of rolling 4 = (number of 4's)/(total) = ?

  129. anonymous
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    28/100

  130. Vocaloid
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    right, now do the same thing with the coin...

  131. Vocaloid
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    probability of heads = (number of heads)/(total) = ?

  132. anonymous
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    how do i do that one

  133. Vocaloid
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    read the problem again............

  134. Vocaloid
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    (number of heads)/(total number of coin flips) =

  135. anonymous
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    44/100

  136. Vocaloid
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    right, now multiply like we did before

  137. anonymous
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    i got c! next!

  138. anonymous
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    Simon used a probability simulator to pull 3 colored marbles from a bag and flip a coin 50 times. The results are shown in the tables below: Color of Marble Number of Times Rolled Blue 15 Green 19 Yellow 16 Heads Tails 26 24 Using Simon's simulation, what is the probability of pulling a blue marble and the coin landing tails up? 39 over 50 250 over 50 120 over 2500 360 over 2500

  139. Vocaloid
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    probability of blue marble = ?

  140. anonymous
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    15

  141. Vocaloid
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    probability of blue marble = (number of blue marbles)/(total) = ?

  142. anonymous
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    15/50

  143. Vocaloid
    • one year ago
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    probability of tails = ?

  144. anonymous
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    24

  145. Vocaloid
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    no, do the same thing we did before...,....

  146. anonymous
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    i got D

  147. Vocaloid
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    probability of tails = (tails)/(total) = ?

  148. anonymous
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    next!

  149. anonymous
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    Sue used a probability simulator to roll a 12-sided number cube 100 times. Her results are shown in the table below: Number on the Cube Number of Times Rolled 1 14 2 12 3 10 4 5 5 16 6 5 7 8 8 18 9 2 10 5 11 2 12 3 Using Sue's simulation, what is the frequency of rolling a 2 on the number cube? 100 over 88 12 over 100 100 over 12 88 over 100

  150. Vocaloid
    • one year ago
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    probability of 2 = ?

  151. anonymous
    • one year ago
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    12

  152. Vocaloid
    • one year ago
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    you keep forgetting the /(total) part

  153. Vocaloid
    • one year ago
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    (number of 2's)/(total) = ?

  154. anonymous
    • one year ago
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    i got 12/100

  155. Vocaloid
    • one year ago
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    right

  156. anonymous
    • one year ago
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    is that the answer?

  157. Vocaloid
    • one year ago
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    yes....

  158. anonymous
    • one year ago
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    At a conference for 250 people, 40% of the participants are French, 45% are Americans, 10% are Germans, and the rest are of other nationalities. How many French participants are at the conference? 150 130 120 100

  159. Vocaloid
    • one year ago
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    (.40)*(number of people) = ?

  160. anonymous
    • one year ago
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    100

  161. Vocaloid
    • one year ago
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    right.

  162. anonymous
    • one year ago
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    ok thanks

  163. Vocaloid
    • one year ago
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    medal please?

  164. anonymous
    • one year ago
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    ofcourse

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