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

Statistics
Tutor: None Selected Time limit: 1 Day

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?

Mar 8th, 2015

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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Mar 8th, 2015
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