John runs a computer software store. He counted 120 people who walked by his store in a day, 57 of whom came into the store. Of the 57, only 20 bought something in the store. Estimate the probability that a person who walks by the store will come in and buy something. Round your answer to the nearest hundredth.
A)0.17
B)0.35
C)0.11
D)0.64
E)none of these choices

Question

Quizplus · Accepted Answer

The probability that a person who walks by the store will come in is 57/120 = 0.475. The probability that a person who comes in will buy something is 20/57 = 0.351. The probability that a person who walks by the store will come in and buy something is 0.475 * 0.351 = 0.166. Rounded to the nearest hundredth, this is 0.17.

John Runs a Computer Software Store