question archive The lengths of a particular? animal's pregnancies are approximately normally? distributed, with mean μ=279 days and standard deviation σ=20 days
The lengths of a particular? animal's pregnancies are approximately normally? distributed, with mean μ=279 days and standard deviation σ=20 days
Subject:StatisticsPrice: Bought3
The lengths of a particular? animal's pregnancies are approximately normally? distributed, with mean μ=279 days and standard deviation σ=20 days.
?(a) What proportion of pregnancies lasts more than 284 ?days?
?(b) What proportion of pregnancies lasts between 264 and 289 ?days?
?(c) What is the probability that a randomly selected pregnancy lasts no more than 239 ?days?
?(d) A? "very preterm" baby is one whose gestation period is less than 249 days. Are very preterm babies? unusual?
Round to four decimals as needed.
