# Basic Probability (Averages)

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1. Suppose that the monthly worldwide average of airplane crashes of commercial planes is 2.0.

(a) What is the probability of exactly 6 crashes in the first 3 months?

(b) What is the probability of having exactly 2 crashes in each of the first two months?

(c) What is the probability of having exactly 2 crashes in the each of the first two months, given that there are exactly 6 crashes in the first 3 months?

*Please specify the terms you use (if necessary) and explain each step of your solutions.

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#### Solution Summary

Basic proability problems are solved.

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