# 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?

https://brainmass.com/math/probability/basic-probability-averages-35984

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