1. The height of grade 1 pupils is approximately normally distributed with µ = 45 inches and s = 2. a. If a pupil is selected at random, what is the probability that is taller than 46 inches?
Z=X−μσZ=\frac{X-\mu}{\sigma}Z=σX−μ
P(X>46)=1−P(X<46)P(X>46)=1-P(X<46)P(X>46)=1−P(X<46)
=1−P(Z<46−452)=1-P(Z<\frac{46-45}{2})=1−P(Z<246−45)
=1−P(Z<0.5)=1-P(Z<0.5)=1−P(Z<0.5)
=1−0.6915=0.3085=1-0.6915=0.3085=1−0.6915=0.3085
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