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14 September, 06:52

Probability theory predicts that there is a 14% chance of a particular softball player hitting 2 home runs in a row. Which of these numbers of simulations of the softball player hitting balls would be most likely to produce results that are closest to those predicted by probability theory?

A. 70

B. 80

C. 50

D. 60

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Answers (1)
  1. 14 September, 07:14
    0
    Probability of success is p = 0.14

    Probability of failure is q = 1 - p = 0.86

    From probability theory, the probability of two consecutive successes is

    p^2 = 0.0196.

    In a Bernoulli trial (with n simulations) and r successes), the probability of success is

    nCr*p^r*q^ (n-r).

    Try n=70, r=2

    P (success) = 70C2*0.14^2*0.86^68 = 0.0017

    Try n=80, r=2

    P (success) = 80C2*0.14^2*0.86^78 = 0.0005

    Try n=50, r=2

    P (success) = 50C2*0.14^2*0.86^48 = 0.0172

    Try n=60, r=2

    P (success) = 60C2*0.14^2*0.86^58 = 0.0055

    The closest answer to 0.0196 occurs when = 50

    Answer: C. 50
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