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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