The lengths of a particular animal's pregnancies are approximately normally distributed, with mean = 271 days and standard deviation o = 20 days. (a) What proportion of pregnancies lasts more than 306 days? (b) What proportion of pregnancies lasts between 266 and 276 days? (c) What is the probability that a randomly selected pregnancy lasts no more than 246 days? (d) A "very preterm" baby is one whose gestation period is less than 221 days. Are very preterm babies unusual? Click the icon to view a table of areas under the normal curve. (a) The proportion of pregnancies that last more than 306 days is 0.0400. (Round to four decimal places as needed.) (b) The proportion of pregnancies that last between 266 and 276 days is 0.1974. (Round to four decimal places as needed.) (c) The probability that a randomly selected pregnancy lasts no more than 246 days is 0.1056. (Round to four decimal places as needed.) (d) A "very preterm" baby is one whose gestation period is less than 221 days. Are very preterm babies unusual? The probability of this event is (Round to four decimal places as needed.) so it V be unusual because the probability is than 0.05,

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Questic
The lengths of a particular animal's pregnancies are approximately normally distributed, with mean µ= 271 days and standard deviation o = 20 days.
(a) What proportion of pregnancies lasts more than 306 days?
(b) What proportion of pregnancies lasts between 266 and 276 days?
(c) What is the probability that a randomly selected pregnancy lasts no more than 246 days?
(d) A "very preterm" baby is one whose gestation period is less than 221 days. Are very preterm babies unusual?
Click the icon to view a table of areas under the normal curve.
(a) The proportion of pregnancies that last more than 306 days is 0.0400.
(Round to four decimal places as needed.)
(b) The proportion of pregnancies that last between 266 and 276 days is 0.1974.
(Round to four decimal places as needed.)
(c) The probability that a randomly selected pregnancy lasts no more than 246 days is 0.1056.
(Round to four decimal places as needed.)
(d) A "very preterm" baby is one whose gestation period is less than 221 days. Are very preterm babies unusual?
The probability of this event is , so it
be unusual because the probability is
than 0.05.
(Round to four decimal places as needed.)
Enter your answer in the answer box and then click Check Answer.
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Transcribed Image Text:Questic The lengths of a particular animal's pregnancies are approximately normally distributed, with mean µ= 271 days and standard deviation o = 20 days. (a) What proportion of pregnancies lasts more than 306 days? (b) What proportion of pregnancies lasts between 266 and 276 days? (c) What is the probability that a randomly selected pregnancy lasts no more than 246 days? (d) A "very preterm" baby is one whose gestation period is less than 221 days. Are very preterm babies unusual? Click the icon to view a table of areas under the normal curve. (a) The proportion of pregnancies that last more than 306 days is 0.0400. (Round to four decimal places as needed.) (b) The proportion of pregnancies that last between 266 and 276 days is 0.1974. (Round to four decimal places as needed.) (c) The probability that a randomly selected pregnancy lasts no more than 246 days is 0.1056. (Round to four decimal places as needed.) (d) A "very preterm" baby is one whose gestation period is less than 221 days. Are very preterm babies unusual? The probability of this event is , so it be unusual because the probability is than 0.05. (Round to four decimal places as needed.) Enter your answer in the answer box and then click Check Answer. All parts showing Clear All Check Answer MAY 吕口 F3 esc F8 F9 F10 FIT FI F2 F4 F5 F6 F7 %23 2$ & 2 3 4 6 7 Q E R T Y * 00 .... 00 00 00
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