Proportion of pregnancies lasts

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As reported by a recentsurvey, thefast-food restaurant with the bestdrive-through time had a mean time spent in thedrive-through of mu equals 63.8μ=63.8 seconds. Assuming drive-through times are normally distributed with σ=2.9 seconds.

What is the probability that a randomly selected car will get through the drive-through in less than 60.1 seconds?

The lengths of a particularanimal's pregnancies are approximately normallydistributed, with mean μ=268 days and standard deviation σ=20 days.

(a) What proportion of pregnancies lasts more than 283 days?

(b) What proportion of pregnancies lasts between 238 and 278 days?

(c) What is the probability that a randomly selected pregnancy lasts no more than 263 days?

(d) A"very preterm" baby is one whose gestation period is less than 223 days. Are very preterm babiesunusual?

Reference no: EM131416717

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