Pollsters are concerned about declining levels of cooperation among persons contacted in surveys. A pollster contacts 77 people
in the 18-21 age bracket and finds that 65 of them respond and 12 refuse to respond. When 301 people in the 22-29 age bracket are contacted, 275 respond and 26 refuse to respond. Assume that 1 of the 378 people is randomly selected. Find the probability of getting someone in the 18-21 age bracket or someone who agreed to respond.