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Of 20 randomly selected customers, what is the probability that less than 5 will request Medium?
Men's Shirt Sizes are determined by neck sizes. Suppose that men's neck sizes are approximately normal distributed with mean 15.9 inches and standard deviation of 0.72 inches.. A retailer sells men's shirts in sizes S, M, L, and XL, where the shirt sizes are:
S 14 < neck size < 15
M 15 < neck size < 16
L 16 < neck size < 17
XL 17 < neck size < 18
XXL 19 < neck size < 21
determine the probability that a customer will request a medium size .
P(15 < X < 16)
= P(-1.25 < Z < 0.138888889)
= 0.449581251
now, out of 20, the probability that y will request medium is
P(Y = y) = [20Cy] (0.449581251)^y (0.550418749)^(20-y)
we need to get
P(Y = 0) + P(Y =1) + P(Y = 2) + P(Y = 3) + P(Y = 4) .
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 WEATHERBEETA LANDA Freestyle Standard Neck Medium 84  US $103.00
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 WEATHERBEETA LANDA Orginal Standard Neck Medium 72 NAVY US $80.00
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 WEATHERBEETA LANDA Orginal Standard Neck Medium 81 NAVY US $80.00
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