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Suppose a poll of 20 voters is taken in a large city. The purpose is to determine x, the number who favor a certain candidate for mayor. Suppose that 60% of all the city’s voters favor the candidate.
a. Find the mean and standard deviation of x.
b. Use Table II of Appendix A to find the probability that x ≤ 10.
c. Use Table II to find the probability that x > 12.
d. Use Table II to find the probability that x = 11.
e. Graph the probability distribution of x, and locate the interval μ ± 2σ on the graph.
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