Question

a recent survey determined the iq score of a random selection of residents of alaska. the accompanying relative frequency distribution table summarizes the results. identify the class width for the given relative frequency distribution.

iq score	relative frequency
70 - 89	23%
90 - 109	46%
110 - 129	19%
130 - 149	7%

(1 point)
19
20
19.5

Explanation:

Step1: Identify class - width formula

Class width = Upper limit of a class - Lower limit of the same class.

Step2: Select a class

Let's take the first class 50 - 69.

Step3: Calculate class width

$69 - 50=19$.

Answer:

19