In \( 1970,91.9 \% \) of American 30 -year-olds eamed more than their parents did at age 30 (adjusted for inflation). In 2014, only \( 50.7 \% \) of Ame (a) What is the probability a randomly selected 30 -year-old in 1970 earned more than their parents at age 30? The probability is 0.9190 . (Round to four decimal places as needed.) (b) What is the probability that two randomly selected 30 -year-olds in 1970 earned more than their parents at age 30 ? The probability is 0.8446 . (Round to four decimal places as needed.) (c) What is the probability that out of ten randomly selected 30 -year-olds in 1970, at least one did not earn more than their parents at age : The probability is 0.5810 . (Round to four decimal places as needed.)
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