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 dailyC. proportin of people smile less than 44 times daily
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
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