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Math Help - Probability Problem

  1. #1
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    Probability Problem

    Probability Problem-misc.png


    This problem was in the textbook. To find the probability of mu we have P(-0.96<Z<1.09)=0.69. So I reasoned the probability of at least for was (0.69)^4(0.31)+(0.69)^5. But the solution has 5*(0.69)^4(0.31)+(0.69)^5. Maybe it is just last, but I'm not sure why we are multiplying by five.
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  2. #2
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    Re: Probability Problem

    Hey Hal2001.

    Hint: For independent A and B, P(A and B) = P(A)P(B)
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  3. #3
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    Re: Probability Problem

    It was late . Woke up this morning and realized the five is simply the binomial coefficient......
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