# Chapter 10 Counting Methods and Probability - 10.5 Find Probabilities of Independent and Dependent Events - Guided Practice for Examples 4 and 5 - Page 719: 4

See below.

#### Work Step by Step

a) $P(tropical \ storm)=\frac{\text{number of tropical storms}}{\text{total number of cyclones}}=\frac{598}{1575}\approx0.38$ b) $P(tropical \ storm|Southern \ hemisphere)=\frac{\text{number of tropical storms in Southern hemisphere}}{\text{total number of cyclones in Southern hemisphere}}=\frac{200}{433}\approx0.462$

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