Answer to Question #167118 in Statistics and Probability for China

Question #167118

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?


1
Expert's answer
2021-02-28T07:02:30-0500

Z=XμσZ=\frac{X-\mu}{\sigma}

P(X>46)=1P(X<46)P(X>46)=1-P(X<46)

=1P(Z<46452)=1-P(Z<\frac{46-45}{2})

=1P(Z<0.5)=1-P(Z<0.5)

=10.6915=0.3085=1-0.6915=0.3085


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