Question

About what percent of calls lasted less than $30$ minutes? $30$ minutes or more?

Short answer

$65$ percent of the calls lasted less than $30$ minutes, while $35$ percent lasted longer.

Step-by-step solution

Step 1. Given

Graph of call length (minutes) Vs cumulative frequency $(\%)$

Step 2. Concept

A cumulative relative frequency graph can be used to depict an individual's location within a distribution or to find a specific percentile within the distribution.

Step 3. Explanation

The graph shows that $65$ percent of the calls were less than $30$ minutes in length. And about a third of the calls lasted more than $30$ minutes.