Answers
#32.
p = 0.9 and n = 215
mean = np = 215 * 0.9 = 193.5
sd = sqrt(215*0.9*0.1) = 4.3989
P(X >= 125)
= P(X > 124.5)
= P(z > (124.5 - 193.5)/4.3989)
= P(z > -15.69)
= 1
#33.
p = 0.56 and n = 500
mean = np = 500 * 0.56 = 280
sd = sqrt(500*0.56*0.44) = 11.0995
P(X <= 200)
= P(X < 199.5)
= P(z < (199.5 - 280)/11.0995)
= P(z < -7.25)
= 0
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