Example 2.17 Of the voters in a city, 40% are Republicans and 60% are Democrats. Among the Republicans 70% are in favor of a bond issue, whereas 80% of the Democrats favor the issue. If a voter is selected at random in the city, what is the probability that he or she favor the bond issue?

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A: Given That P(X>5)=0.5

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A: Men = 21SD = 3.5Lead time = 2/7 = 0.2857

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A: P(Z<0.55)=0.70884P(Z<1.4) = 0.91924P(Z<1.96) =0.975

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