Chapter 2.1, Problem 1.3CYU

To determine

To explain: percentage eof calls lasted less than $30$ minutes, about $30$ minutes or more than $30$ minutes.

Answer to Problem 1.3CYU

  $65\%$ of the calls are lasted less than $30$ minutes while $35\%$ of calls lasted more than $30$ minutes.

Explanation of Solution

Given information:

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

  

It is observed from the graph that $65\%$ of the calls arre lasted less than $30$ minutes. And near about $35\%$ of calls lasted more than $30$ minutes.