Chapter 11.5, Problem 12E

a.

To determine

How many students in school play the saxophone?

Answer to Problem 12E

  $40$ Students in school play the saxophone

Explanation of Solution

Given information : The question is

A survey concludes that $4\%$ students in school play the saxophone out of $1000$

Calculation :

  $\frac{4}{100}\times 1000=40$

So, $40$ Students in school play the saxophone

b.

To determine

How many students in school play the saxophone in math class ?

Answer to Problem 12E

  $69$ Students in school play the saxophone

Explanation of Solution

Given information : The question is

$2$ Of the $29$ people in a math class play saxophone

Calculation :

  $\frac{2}{29}\times 100=6.9\%$

So, $6.9\%$ of $1000$ that means $69$ students in school play the saxophone

c.

To determine

Which prediction is more accurate?

Answer to Problem 12E

Prediction of part (a) is more accurate

Explanation of Solution

Given information : The question is

In part(a) or part(b) which one is more accurate

Calculation : Prediction of part (a) is more accurate as the population used there is the whole town while in part (b) only math class is the population