Chapter 20, Problem 26A

Summary Introduction

To calculate:

Percent of individuals in class having mold allergy.

Introduction:

Mold is a fungus, which can easily grow in moist and damp places. The molds are generally non-harmful, but some people may have serious allergies to mold.

Explanation of Solution

To calculate the percentage of student allergic to mold, following formula should be used:

  $\text{Percentage}=\frac{\text{Total selected individuals}}{\text{Total individuals}}\times 100$

Let’s assume a class has 40 students and 10 of them have mold allergy:

  $\begin{array}{c}\text{Percentage of student having mold allergy}=\frac{\text{10}}{\text{40}}\times 100\\ =\frac{\text{1}}{\text{4}}\times 100\\ =25\%\end{array}$