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People smile an average of 62 times daily.

Mathematics
Tutor: None Selected Time limit: 0 Hours

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

Nov 15th, 2014

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


Nov 15th, 2014

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