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3 years ago

15

A normal population has a mean of 57 and a standard deviation of 13. You select a random sample of 9. Compute the probability th

at the sample mean is: (Round your z values to 2 decimal places and final answers to 4 decimal places):

1 answer:

Keith_Richards [23]3 years ago

6 0

Yes that’s correct I think

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Answer:

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And using the probability mass function we got:

$P(X=7)=(15C7)(0.23)^7 (1-0.23)^{15-7}=0.0271$

Step-by-step explanation:

Let X the random variable of interest, on this case we now that:

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The probability mass function for the Binomial distribution is given as:

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Where (nCx) means combinatory and it's given by this formula:

$nCx=\frac{n!}{(n-x)! x!}$

And we want to find the following probability:

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And using the probability mass function we got:

$P(X=7)=(15C7)(0.23)^7 (1-0.23)^{15-7}=0.0271$

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Answer:

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Step-by-step explanation:

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2 years ago