The lengths of a particular animal's pregnancies are approximately normally distributed, with mean mu = 273 days and standard deviation sigma = 16days (a) What proportion of pregnancies lasts more than 281 days? (b) What proportion of pregnancies lasts between 253 and 285 days? (c) What is the probability that a randomly selected pregnancy lasts no more than 265 days

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The lengths of a particular animal's pregnancies are approximately normally distributed, with mean mu = 273 days and standard deviation sigma = 16days

(a) What proportion of pregnancies lasts more than 281 days?

(b) What proportion of pregnancies lasts between 253 and 285 days?

(c) What is the probability that a randomly selected pregnancy lasts no more than 265 days

(d) A very preterm" baby is one whose gestation period is less than 233 days. Are very preterm babies unusual?

The lengths of a particular animal's pregnancies are approximately normally distributed, with mean \( \mu = 273 \) days and standard deviation \( \sigma = 16 \) days.

- (a) What proportion of pregnancies lasts more than 281 days?
- (b) What proportion of pregnancies lasts between 253 and 285 days?
- (c) What is the probability that a randomly selected pregnancy lasts no more than 265 days?
- (d) A "very preterm" baby is one whose gestation period is less than 233 days. Are very preterm babies unusual?

Below are the questions with placeholders for the answers:

(a) The proportion of pregnancies that last more than 281 days is \(\rule{2cm}{0.15mm}\).
(Round to four decimal places as needed.)

(b) The proportion of pregnancies that last between 253 and 285 days is \(\rule{2cm}{0.15mm}\).
(Round to four decimal places as needed.)

(c) The probability that a randomly selected pregnancy lasts no more than 265 days is \(\rule{2cm}{0.15mm}\).
(Round to four decimal places as needed.)

(d) The probability of a “very preterm” baby is \(\rule{2cm}{0.15mm}\). This event \(\rule{2cm}{0.15mm}\) unusual because the probability is \(\rule{2cm}{0.15mm}\) than 0.05.
(Round to four decimal places as needed.)
Transcribed Image Text:The lengths of a particular animal's pregnancies are approximately normally distributed, with mean \( \mu = 273 \) days and standard deviation \( \sigma = 16 \) days. - (a) What proportion of pregnancies lasts more than 281 days? - (b) What proportion of pregnancies lasts between 253 and 285 days? - (c) What is the probability that a randomly selected pregnancy lasts no more than 265 days? - (d) A "very preterm" baby is one whose gestation period is less than 233 days. Are very preterm babies unusual? Below are the questions with placeholders for the answers: (a) The proportion of pregnancies that last more than 281 days is \(\rule{2cm}{0.15mm}\). (Round to four decimal places as needed.) (b) The proportion of pregnancies that last between 253 and 285 days is \(\rule{2cm}{0.15mm}\). (Round to four decimal places as needed.) (c) The probability that a randomly selected pregnancy lasts no more than 265 days is \(\rule{2cm}{0.15mm}\). (Round to four decimal places as needed.) (d) The probability of a “very preterm” baby is \(\rule{2cm}{0.15mm}\). This event \(\rule{2cm}{0.15mm}\) unusual because the probability is \(\rule{2cm}{0.15mm}\) than 0.05. (Round to four decimal places as needed.)
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