Question

The figure shows a cumulative relative frequency graph of the number of ounces of alcohol consumed per week in a sample of $150$ adults who report drinking alcohol occasionally. About what percent of these adults consume between $4$ and $8$ ounces per week?

$$\begin{gathered} a.20\% \\ b.40\% \\ c.50\% \\ d.60\% \\ e.80\% \end{gathered}$$

Short answer

The correct option is (b)$40\%$

Step-by-step solution

Given information

Calculation

The cumulative relative frequency diagram has pointed at $(4,20)$ and $(4,20),$ respectively $(8,60)$This indicates that approximately $60\%$ of adults consume less than $8$ ounces per week, and approximately $20\%$ consume less than $4$ ounces per week.

$60\%-20\%=40\%$

It is estimated that $60$ percent $-20$ percent $=40$ percent of individuals consume $4$ to $8$ ounces of alcohol every week.