Pollsters are concerned about declining levels of cooperation among persons cont

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 55 of them respond and 20 refuse to respond. When 290 people in the 22-29 age bracket are contacted, 260 respond and 30 refuse to respond. Suppose that one of the 365 people is randomly selected. Find the probability of getting someone in the 22-29 age bracket or someone who responded. P(person is in the 22-29 age bracket or responded) (Do not round until the final answer. Then round to three decimal places as needed.)

Explanation / Answer

from above information:

hence P(peson is in 22-29 age or responded) =(260+30+55)/365= 0.945

respond do not respond total 18-21 55 20 75 22-29 260 30 290 total 315 50 365

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