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Section 7.2 Homework
10.
The lengths of a particular animal’s pregnancies are approximately normally distributed, with mean
days and standard deviation
days.
(a) What proportion of pregnancies lasts more than
days?
(b) What proportion of pregnancies lasts between
and
days?
(c) What is the probability that a randomly selected pregnancy lasts no more than
days?
(d) A “very preterm” baby is one whose gestation period is less than
days. Are very preterm babies unusual?
(a) The proportion of pregnancies that last more than 258 days is
(b) The proportion of pregnancies that last between 246 and 255 days is
(c) The probability that a randomly selected pregnancy lasts no more than 237 days is
(d) A “very preterm” baby is one whose gestation period is less than 222 days. Are very preterm babies unusual? The probability of this event is
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This question is taken from Math 136 – Introduction to Statistics » Summer 2021 » Section 7.2 Homework