The lengths of a particular​ animal's pregnancies are approximately normally​ distributed, with mean μ=263 days and standard deviation σ=16 days.   ​(a) What proportion of pregnancies lasts more than 287 ​days? ​(b) What proportion of pregnancies lasts between 251 and 275 ​days? ​(c) What is the probability that a randomly selected pregnancy lasts no more than 243 ​days?   A​ "very preterm" baby is one whose gestation period is less than 223 days. Are very preterm babies​ unusual?

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Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.