Chapter 2.1, Problem 7E

(a)

To determine

To describe: the student represented by the high-lighted point

Answer to Problem 7E

Here, $80\%$ of thefemales sent and received messages less than 212 messages in a two-day period.

Explanation of Solution

Given:

  

The highlighted point corresponds to students who received/ send 200 text messages which is at the ${80}^{\text{th}}$ percentile.

This shows that the highlighted point shows the ${80}^{\text{th }}$ percentile. This means that $80\%$ of thefemales sent and received messages less than 212 messages in a two-day period.

(b)

To determine

To estimate:the median number of texts.

Answer to Problem 7E

The median of the text messages sent is 115

Explanation of Solution

Given:

  

Calculation:

The median has the property that 50% of all data values are smaller than the median and thus the median is the same as the ${50}^{\text{th}}$ percentile.

Locate 50 on the vertical axis and determine the corresponding value on the horizontal axis.

Hence, the median of the text messages sent is 115

Conclusion:

Hence, the median of the text messages sent is 115