According to the South Air Quality Management, the level of nitrogen dioxide, a brown gas that impairs breathing, present in the atmosphere on a certain May day in downtown LA is approximated by A(t) = 0.063t3(t - 7)4 + 20.2       ; (0 < t < 7), where A(t) is measured in pollutant standard index and t is measured in hours, with t 0 corresponding to 7am. Find A'(3).

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A: Given, E(X) = 2, E(Y) = 18, a = 0.05, and b = 0.95

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A: E(X) = 62, E(Y) = 91, a = 0.38, and b = 0.62.E(aX+bY)=aE(x)+bE(y)

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A: Given,E(X) = 69, E(Y) = 91, a = 0.43, and b = 0.57

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A: Given,E(X)=77E(Y)=48a=0.36b=0.64