Please help me and show the steps also with your calculator.

label Statistics
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What is the probability that the mean duration of these patients' pregnancies will be less than 264 days?

The mean is 262.

I know you have to put in Normal CDF, but what in the parenthesis?

Also, how is the answer 0.916?

Oct 20th, 2017

You have not provided the value of sigma.

P( x< 264 | mu =262, sigma)

This is same as 

P( z < (264-mu)/sigma) )

You can compute (264-mu)/sigma and then you can refer to normal tables or excel normdist function

Mar 8th, 2015

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Oct 20th, 2017
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