anonymous
  • anonymous
help!
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
I got my questions answered at brainly.com in under 10 minutes. Go to brainly.com now for free help!
anonymous
  • anonymous
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
anonymous
  • anonymous
@Vocaloid
Vocaloid
  • Vocaloid
number of green chips/number of total chips = ?

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anonymous
  • anonymous
i dont get it
Vocaloid
  • Vocaloid
number of green chips = ?
anonymous
  • anonymous
4
Vocaloid
  • Vocaloid
total number of chips = ?
anonymous
  • anonymous
4
Vocaloid
  • Vocaloid
read the problem again.... how many chips are there in total?
Vocaloid
  • Vocaloid
add all the colors together...
anonymous
  • anonymous
oh, 28
Vocaloid
  • Vocaloid
right, so number of green chips/number of total chips = ?
anonymous
  • anonymous
4/28
Vocaloid
  • Vocaloid
right. since he picks out two chips (with replacement) we multiply: (4/28)*(4/28) = ?
anonymous
  • anonymous
0.02040816326
Vocaloid
  • Vocaloid
as a fraction, please...
anonymous
  • anonymous
ok
anonymous
  • anonymous
1/49
Vocaloid
  • Vocaloid
don't reduce the fraction 4*4 = ?
anonymous
  • anonymous
16
Vocaloid
  • Vocaloid
right, and 28*28 = ?
anonymous
  • anonymous
784
Vocaloid
  • Vocaloid
right, so (4/28)*(4/28) = 16/784, so our answer is...?
anonymous
  • anonymous
A!
Vocaloid
  • Vocaloid
right
anonymous
  • anonymous
ok next
anonymous
  • anonymous
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
Vocaloid
  • Vocaloid
look at each of the ordered pairs, and count how many add up to 4
anonymous
  • anonymous
what do u mean?
Vocaloid
  • Vocaloid
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)...
anonymous
  • anonymous
ok
Vocaloid
  • Vocaloid
keep following the pattern and see how many pairs add up to 4
anonymous
  • anonymous
(1,3) = 4
Vocaloid
  • Vocaloid
right, keep going...
anonymous
  • anonymous
(2,2) and (3,1)
Vocaloid
  • Vocaloid
right, so we have 3 pairs out of 36, so our answer is 3/36
anonymous
  • anonymous
oh okay! next!
Vocaloid
  • Vocaloid
how many are there??
anonymous
  • anonymous
like 10
anonymous
  • anonymous
but they are quick ones :)
anonymous
  • anonymous
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
Vocaloid
  • Vocaloid
how many roses does she begin with?
anonymous
  • anonymous
um, 1
Vocaloid
  • Vocaloid
read the problem again... how many roses are there at the beginning?
anonymous
  • anonymous
5
Vocaloid
  • Vocaloid
ok, after one gets taken away, how many are left?
anonymous
  • anonymous
3
Vocaloid
  • Vocaloid
no, please try again... there are 5 to begin with, one gets taken away, how many are left?
anonymous
  • anonymous
4
Vocaloid
  • Vocaloid
right... now, let's read the problem again. how many total cards are there at the begining?
anonymous
  • anonymous
5
Vocaloid
  • Vocaloid
total cards = roses + daisies = ?
anonymous
  • anonymous
8
Vocaloid
  • Vocaloid
right, so we start with 8, then we take one away, how many are left?
anonymous
  • anonymous
7
Vocaloid
  • Vocaloid
right, so our probability of getting a rose again is 4/7
anonymous
  • anonymous
ok so A?
Vocaloid
  • Vocaloid
yes
anonymous
  • anonymous
ok next!
anonymous
  • anonymous
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
Vocaloid
  • Vocaloid
(number of colors)*(number of sides on a coin) = ?
anonymous
  • anonymous
what are the number of colors and number of sides on a coin
Vocaloid
  • Vocaloid
read the problem...
anonymous
  • anonymous
um 4 colors and 2 coins?
Vocaloid
  • Vocaloid
right, so (number of colors)*(number of sides on a coin) = ?
anonymous
  • anonymous
8
Vocaloid
  • Vocaloid
right.
anonymous
  • anonymous
ok next!
anonymous
  • anonymous
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
Vocaloid
  • Vocaloid
(number of pink shirts)/(total number of shirts) = ?
anonymous
  • anonymous
48
Vocaloid
  • Vocaloid
/ means divide...
Vocaloid
  • Vocaloid
(4/12)*(1/2) = ?
anonymous
  • anonymous
1/3
Vocaloid
  • Vocaloid
let's leave it as 4/12 for now (4/12)*(1/2) = ?
anonymous
  • anonymous
1/6
Vocaloid
  • Vocaloid
let's not simplify the fractions, ok? 4*1 = ?
anonymous
  • anonymous
4
Vocaloid
  • Vocaloid
and 12*2 = ?
anonymous
  • anonymous
24
Vocaloid
  • Vocaloid
right, so (4/12)*(1/2) = 4/24
anonymous
  • anonymous
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%
Vocaloid
  • Vocaloid
multiply the two probabilities together
Vocaloid
  • Vocaloid
(0.6)*(0.1) = ?
anonymous
  • anonymous
0.7
Vocaloid
  • Vocaloid
* means multiply...
Vocaloid
  • Vocaloid
(0.6)*(0.1) = ?
anonymous
  • anonymous
0.6
Vocaloid
  • Vocaloid
no, please try again... what is 0.6 times 0.1? use a calculator if you are not sure...
anonymous
  • anonymous
0.06
Vocaloid
  • Vocaloid
right, now convert that to a percentage by multiplying by 100 0.06*100 = ?
anonymous
  • anonymous
6
Vocaloid
  • Vocaloid
right, so our final answer is 6%
anonymous
  • anonymous
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
Vocaloid
  • Vocaloid
(number of green marbles) / (number of total marbles) = ?
anonymous
  • anonymous
3/10
Vocaloid
  • Vocaloid
right... that's the first marble. now, we started with 3 green ones, how many are left after we take one away?
anonymous
  • anonymous
2
Vocaloid
  • Vocaloid
right. now, we started off with 10 total marbles, how many are left after we take one away?
anonymous
  • anonymous
9
Vocaloid
  • Vocaloid
so our final answer is (3/10)*(2/9)...
anonymous
  • anonymous
6/90
Vocaloid
  • Vocaloid
read the answer choices...
anonymous
  • anonymous
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
Vocaloid
  • Vocaloid
this is almost the same problem as the last one, just with different numbers... can you try this one yourself?
anonymous
  • anonymous
no, i need you to help me :)
Vocaloid
  • Vocaloid
read over the other problem again and try this one yourself...
Vocaloid
  • Vocaloid
it's literally the same thing all over again
anonymous
  • anonymous
:(
Vocaloid
  • Vocaloid
(number of chocolates)/(total) = ?
anonymous
  • anonymous
8/24
Vocaloid
  • Vocaloid
right, and (vanillas)/(total - 1) = ?
anonymous
  • anonymous
10/23
Vocaloid
  • Vocaloid
right, so multiply them together like we've always done
anonymous
  • anonymous
80/552
anonymous
  • anonymous
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
Vocaloid
  • Vocaloid
alright, probability of rolling 4 = ?
anonymous
  • anonymous
28
Vocaloid
  • Vocaloid
probability of rolling 4 = (number of 4's)/(total) = ?
anonymous
  • anonymous
how do i get that answer?
Vocaloid
  • Vocaloid
how many total times was the number cube rolled?
anonymous
  • anonymous
100
Vocaloid
  • Vocaloid
and how many times was 4 rolled?
anonymous
  • anonymous
1
Vocaloid
  • Vocaloid
read the problem again...
Vocaloid
  • Vocaloid
how many times was 4 rolled?
anonymous
  • anonymous
28
Vocaloid
  • Vocaloid
right, so probability of rolling 4 = (number of 4's)/(total) = ?
anonymous
  • anonymous
28/100
Vocaloid
  • Vocaloid
right, now do the same thing with the coin...
Vocaloid
  • Vocaloid
probability of heads = (number of heads)/(total) = ?
anonymous
  • anonymous
how do i do that one
Vocaloid
  • Vocaloid
read the problem again............
Vocaloid
  • Vocaloid
(number of heads)/(total number of coin flips) =
anonymous
  • anonymous
44/100
Vocaloid
  • Vocaloid
right, now multiply like we did before
anonymous
  • anonymous
i got c! next!
anonymous
  • anonymous
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
Vocaloid
  • Vocaloid
probability of blue marble = ?
anonymous
  • anonymous
15
Vocaloid
  • Vocaloid
probability of blue marble = (number of blue marbles)/(total) = ?
anonymous
  • anonymous
15/50
Vocaloid
  • Vocaloid
probability of tails = ?
anonymous
  • anonymous
24
Vocaloid
  • Vocaloid
no, do the same thing we did before...,....
anonymous
  • anonymous
i got D
Vocaloid
  • Vocaloid
probability of tails = (tails)/(total) = ?
anonymous
  • anonymous
next!
anonymous
  • anonymous
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
Vocaloid
  • Vocaloid
probability of 2 = ?
anonymous
  • anonymous
12
Vocaloid
  • Vocaloid
you keep forgetting the /(total) part
Vocaloid
  • Vocaloid
(number of 2's)/(total) = ?
anonymous
  • anonymous
i got 12/100
Vocaloid
  • Vocaloid
right
anonymous
  • anonymous
is that the answer?
Vocaloid
  • Vocaloid
yes....
anonymous
  • anonymous
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
Vocaloid
  • Vocaloid
(.40)*(number of people) = ?
anonymous
  • anonymous
100
Vocaloid
  • Vocaloid
right.
anonymous
  • anonymous
ok thanks
Vocaloid
  • Vocaloid
medal please?
anonymous
  • anonymous
ofcourse

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