SOLUTION: About 30% of the US population is under 20 years old. About 17% of the population is over 60. Which of the following is the probability that a person chosen at random is under 20 o

Algebra ->  Probability-and-statistics -> SOLUTION: About 30% of the US population is under 20 years old. About 17% of the population is over 60. Which of the following is the probability that a person chosen at random is under 20 o      Log On


   

Question 1007535: About 30% of the US population is under 20 years old. About 17% of the population is over 60. Which of the following is the probability that a person chosen at random is under 20 or over 60?
17%
53%
47%
30%
I think it's 47%. am i right?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
A = person is under 20
B = person is over 60

P(A or B) = P(A) + P(B) ... works because A and B are mutually exclusive

P(A or B) = 0.30 + 0.17

P(A or B) = 0.47 = 47%

you are correct. Nice work