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anonymous

  • one year ago

(06.02)A bag contains 40 marbles, 4 of which are blue, 10 are red, 25 are green, and 1 is purple. Shawna takes a marble out of the bag, records the color, and returns it to the bag. How many green marbles should she expect after 400 trials? 25 40 100 250

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  1. anonymous
    • one year ago
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    can anybody help?

  2. welshfella
    • one year ago
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    there are 25 green marbles out of a total of 40 so the property of picking a green marble is 25/40 = 5/8

  3. welshfella
    • one year ago
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    so the expected number in 400 tyrials is 400 * 5/8

  4. anonymous
    • one year ago
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    but thats not one of the answers

  5. welshfella
    • one year ago
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    work it out

  6. anonymous
    • one year ago
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    all it gives me is: 25 40 100 250

  7. welshfella
    • one year ago
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    multiply 400 by 5 then divide by 8

  8. anonymous
    • one year ago
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    the answers 200?

  9. welshfella
    • one year ago
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    no

  10. welshfella
    • one year ago
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    its just calculator work

  11. anonymous
    • one year ago
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    oh its 250 i was trying to do it in my head lol thank you so much :)

  12. welshfella
    • one year ago
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    yw

  13. anonymous
    • one year ago
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    can you help me with another one

  14. welshfella
    • one year ago
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    ok

  15. anonymous
    • one year ago
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    (06.02)A six-sided number cube labeled 1 through 6 is rolled 500 times. An odd number is rolled 325 times. Compare the experimental probability of rolling an odd number with the theoretical probability of rolling an odd number and select one of the statements below that best describes the situation. The experimental probability and theoretical probability are the same The experimental probability is larger than the theoretical probability The experimental probability is smaller than the theoretical probability There is not enough information to determine the relative frequency

  16. anonymous
    • one year ago
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    sorry it took me a while t o type out lol

  17. welshfella
    • one year ago
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    the experimental P of rolling odd = 325/500 = 13/20

  18. anonymous
    • one year ago
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    ok?

  19. anonymous
    • one year ago
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    what does that mean lol

  20. welshfella
    • one year ago
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    now what do you think the theoretical probability of getting an odd number is? Note there are an equal number of odd and even numbers on the cube

  21. anonymous
    • one year ago
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    oh A

  22. anonymous
    • one year ago
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    thats what i got before lol but i thought it was wrong xD

  23. welshfella
    • one year ago
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    the experimental probability is the result of experimenting - the 500 rolls of the cube.

  24. anonymous
    • one year ago
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    so A?

  25. welshfella
    • one year ago
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    no they are not the same the theoretical is what you might expect to get - due to the fact that there are an equal number of odd and even numbers

  26. anonymous
    • one year ago
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    im so confused

  27. welshfella
    • one year ago
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    on a coin you have 2 things heads or tails - what is Probability of getting a head?

  28. anonymous
    • one year ago
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    50%

  29. welshfella
    • one year ago
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    yes or as a fraction its 1/2 - well its same for odd numbers on a dice - 2 possiblities odd or even

  30. anonymous
    • one year ago
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    can you give me the answer lol i dont get any of this

  31. welshfella
    • one year ago
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    experimental probability = 13/20 theoretical probability = 1/2 so now you can pick the correct option

  32. welshfella
    • one year ago
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    - which is the largest?

  33. anonymous
    • one year ago
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    epirement

  34. welshfella
    • one year ago
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    correct Now you have it.

  35. anonymous
    • one year ago
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    thanks again

  36. welshfella
    • one year ago
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    yw

  37. anonymous
    • one year ago
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    i wish you could help me with my whole test lol T^T

  38. anonymous
    • one year ago
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    im really stupid xD

  39. welshfella
    • one year ago
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    we are here to help you understand read over the posts and try to understand why we have done what we've done.

  40. welshfella
    • one year ago
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    you understand the coin part so you should understand the cube part you have 6 numbers on a cube 135 and 246 - that is 2 lots - one odd and one even so P(even) = 3/6 = 1/2 and P(odd) = 3/6 = 1/2 also

  41. anonymous
    • one year ago
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    but could you help me with the rest of the test, sorry to ask but i have 13 more mintues until my times up and then i wont be able to enter the tests again so im trying to rush

  42. anonymous
    • one year ago
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    and oh ok

  43. anonymous
    • one year ago
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    yeah i understand it better now

  44. welshfella
    • one year ago
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    no i haven't got the time for that . And thats not what openstudy is about

  45. anonymous
    • one year ago
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    ok but thanks for the previus help!

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