Q no. 15 solution please🙏
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is the ans A,
first calculate expected no of sales which is as follow ; P(X) = .05*70+ .25*40 … =37.75
then calculate then calculate variance which is as follow ; p(X-X^)square. the square root the varience ; as follow :
.05(70-37.75)square + .70(40-37.75) square + .25(25-37.75)square * = 96.18750
Variance = 96.1875square
S.D = 9.8075 or 9.81