Stat question for MAth

Question

Pollsters are concerned about declining levels of cooperation among persons contacted in surveys. A pollster contacts 75 people in the 18-21 age bracket and finds that 64 of them respond and 11 refuse to respond. When 266 people in the 22-29 age bracket are contacted, 249 respond and 17 refuse to respond. Assume that 1 of the 341 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

Age Respond Don't Respond Total

18 - 21 64 11 75

22-29 249 17 266

Total 313 28 341

P(18-21 or refuse to respond) = P(18-21) + P(refuse to respond) - P(18 - 21 and refuse to respond)

= 75/341 + 28/341 - 11/341 = 92/341 = 0.2698 ~ 27%