Chapter 11, Problem 8CR

To determine

To Predict : The number of students at school that would prefer to exercise before school.

Answer to Problem 8CR

Explanation of Solution

Given information :

Consider the information provided in the question.

In a random sample, every member of the population has equal chance of being selected.

Find the percent of students that prefer to exercise before school:

  $\begin{array}{l}\frac{70}{400}\times 100=\frac{7}{40}\times 100=\frac{70}{4}\%\text{ [convert into percentage]}\\ \frac{70}{4}\%\times 1000=\frac{70}{400}\times 1000=175\text{ [simplify]}\end{array}$

Thus $175$ students in the school would prefer to exercise before school.