People smile an average of 62 times daily.

User Generated

jitny1983

Mathematics

Description

The distribution of smiles is approx normal with a S.D. of 18 find each of the values

A.  proportion of people smile more than 80 times daily

B.  proportion of people smile at least 50 times daily
C.  proportin of people smile less than 44 times daily

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Explanation & Answer

A z score = (80 -62)/18 =1

P (z>1)= 0.1587

b z score = (50 -62)/18 =-0.667

P (z>-0.667)= 0.7486

c. z score = (44 -62)/18 =-1

P (z<-1)= 0.1587



Anonymous
Really useful study material!

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