The data from a study shows that 15 out of every 100 people are left-handed. At this rate, in a school of 480 students, how many would be expected to be left-handed?

Question

Quizplus · Accepted Answer

This is a ratio/proportion problem. We have 15 left-handed people out of every 100. So, how many left-handed children would be in a school of 480 students? We can write that as a proportion: 15: 100 :: x: 480 Step 1: Rewrite the proportion as a fraction. ¹⁵⁄₁₀₀ = ^x⁄₄₈₀ Step 2: Cross multiply. 15 • 480 = 100 • x Step 3: Simplify. 15 • 480 = 100 • x 7200 = 100x Step 4: Simplify by dividing both sides of the equation by 100 7200 ÷ 100 = 100x ÷ 100 72 = x

The Data from a Study Shows That 15 Out of Every