According to a recent medical publications, 1 in every 150 Americans have a form of Lupus. At that rate, in a metropolitan area of 650,000 Americans, how many would you expect to have some form of Lupus?

Question

Quizplus · Accepted Answer

This is a ratio/proportion problem. We know that 1 in ever 150 Americans have a form of Lupus. So, how many adults in a group of 650,000 would have a form of Lupus? We can write that as a proportion: 1: 150 :: x: 650,000 Step 1: Rewrite the proportion as a fraction. ¹⁄₁₅₀ = ^x⁄_650,00 Step 2: Cross multiply. 1 • 650,000 = 150 • x Step 3: Simplify. 1 • 650,000 = 150 • x 650,000 = 150x Step 4: Simplify by dividing both sides of the equation by 150. 650,000 ÷ 150 = 150x ÷ 150 x = 4,333.33 Step 5: Since the answer choices do not include a decimal, round to the nearest ones place. x = 4,333

According to a Recent Medical Publications, 1 in Every 150