Solution-Proportion of pregnancies lasts

Proportion of pregnancies lasts

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Reference no: EM131416717

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?

(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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Proportion of pregnancies lasts

Reference no: EM131416717

Reference no: EM131416717

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