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

The mean is 262.

Standard deviation of 1.45

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

Also, how is the answer 0.916?

z value = (264-262)/1.45 = 2/1.45 =1.379 = 1.38

P( z < 1.38) = 0.916

In Excel i got 0.9161

if three decimals 0.916

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