Find the probability

Question

Pollsters are concerned about declining levels of cooperation among persons contacted in surveys. A pollster contacts 97 people in the 18-21 age bracket and finds that 82 of them respond and 15 refuse to respond. When 289 people in the 22-29 age bracket are contacted, 256 respond and 33 refuse to respond. Assume that 1 of the 386 people is randomly selected. Find the probability of getting someone in the 18-21 age bracket or someone who refused to respond.

Report the answer as a percent rounded to one decimal place accuracy. You need not enter the "%" symbol. 

prob = 

Answer 1

Hi Shieka,

We want to know how many people are in the 18-21 age bracket or refused to respond, so we will accept anyone who falls into at least one of these categories. There are 97 people aged 18-21, plus another 33 who refused to respond from the other age group. That total of 97 + 33 = 130 people is our numerator, out of 386 people so we get:

130 / 386 = 33.7 percent.

Please let me know if I can be more helpful, thanks!

Joe