The length of human pregnancies from conception to birth varies according to a distribution that is normal with mean 266 days and standard deviation 16 days. Between what values do the lengths of the middle 95% of all pregnancies fall?
How short are the shortest 2.5% of all pregnancies?
How long are the longest 2.5% all pregnancies?
How short are the shortest 2.5% of all pregnancies?
How long are the longest 2.5% all pregnancies?
1 Answer
Jan 23, 2017
Explanation:
Probability of Z score between middle 95% is 0.025 each side.
Therefore the value of length is