# Chapter 5 - Discrete Probability Distributions - Review - Review Exercises: 10

a) 0.6 b)0.5488 c)16.46 d)quite close

#### Work Step by Step

a) The mean: $\frac{18}{30}=0.6.$ b)$P(X=0)=\frac{0.6^0\cdot e^{-0.6}}{0!}=0.5488.$ c) Expected number:$30\cdot 0.5488=16.46.$ d)The expected number is quite close to the actual number.

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