Homework Answers
Solution:- Given that mean = 17, sd = 4,
a. for n = 36
P(16.5 < X < 17.5) = P((16.5-17)/(4/sqrt(36)) <
(X-mean)/(sd/sqrt(n)) < (17.5-17)/(4/sqrt(36))
= P(-0.75 < Z < 0.75)
= P(Z < 0.75) − P(Z < −0.75)
= 0.7734 - 0.2266
= 0.5468
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