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Mathematics, 03.07.2019 02:10 samdoesmath6352

The lengths of a particularâ animal's pregnancies are approximately normallyâ distributed, with mean muî¼equals=270270 days and standard deviation sigmaïequals=2020 days. â(a) what proportion of pregnancies lasts more than 275275 âdays? â(b) what proportion of pregnancies lasts between 255255 and 285285 âdays? â(c) what is the probability that a randomly selected pregnancy lasts no more than 230230 âdays? â(d) aâ "very preterm" baby is one whose gestation period is less than 240240 days. are very preterm babiesâ unusual?

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