Description
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?
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Explanation & Answer
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
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