Find the indicated probability.
-A study of consumer smoking habits includes 186 people in the 18-22 age bracket (42 of whom smoke), 124 people in the 23-30 age bracket (40 of whom smoke), and 99 people in the 31-40 age bracket (21 of whom
Smoke). If one person is randomly selected from this sample, find the probability of getting someone who is age
18-22 or does not smoke.
A) 0.774
B) 0.352
C) 0.851
D) 1.203

Question

Quizplus · Accepted Answer

The probability of selecting someone who is age 18-22 or does not smoke is calculated by adding the probability of selecting someone age 18-22 and the probability of selecting a non-smoker, then subtracting the probability of selecting someone who is both age 18-22 and a smoker. The total number of people is 409. The probability is (186/409) + (306/409) - (42/409) = 0.851.

Find the Indicated Probability