In: Statistics and Probability
The lengths of a particular animal's pregnancies are approximately normally distributed, with mean
mu
equals280days and standard deviation
sigma
equals12
days.
(a) What proportion of pregnancies lasts more than
301
days?
(b) What proportion of pregnancies lasts between
262
and
283
days?
(c) What is the probability that a randomly selected pregnancy lasts no more than
256
days?
(d) A "very preterm" baby is one whose gestation period is less than
250
days. Are very preterm babies unusual?
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(a) The proportion of pregnancies that last more than
301
days is
nothing
.
(Round to four decimal places as needed.)
(b) The proportion of pregnancies that last between
262
and
283
days is
nothing
.
(Round to four decimal places as needed.)
(c) The probability that a randomly selected pregnancy lasts no more than
256
days is
nothing
.
(Round to four decimal places as needed.)
(d) A "very preterm" baby is one whose gestation period is less than
250
days. Are very preterm babies unusual?
The probability of this event is
nothing
,
so it
▼
would not
would
be unusual because the probability is
▼
greater
less
than 0.05.
(Round to four decimal places as needed.)