Frequency, Frequency Tables, and Levels of Measurement · Exercise 7

contains data on hurricanes that have made direct hits on the U.S. Between 1851 and 2004. A hurricane is given a strength category rating based on the minimum wind speed generated by the storm.
$$\begin{array}{cccc}\text{Category}& \text{Number of Direct Hits}& \text{Relative Frequency}& \text{Cumulative Frequency}\\ \text{1}& \text{109}& \text{0.3993}& \text{0.3993}\\ \text{2}& \text{72}& \text{0.2637}& \text{0.6630}\\ \text{3}& \text{71}& \text{0.2601}& \\ \text{4}& \text{18}& & \text{0.9890}\\ \text{5}& \text{3}& \text{0.0110}& \text{1.0000}\\ & \text{Total = 273}& & \end{array}$$

What is the relative frequency of direct hits that were category 4 hurricanes?

(a) 0.0768
(b) 0.0659
(c) 0.2601
(d) Not enough information to calculate

OpenStax, Introductory Statistics 2e · §1.3 Frequency, Frequency Tables, and Levels of Measurement · Exercise 7