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. LO9

a. Find the mean and standard deviation of x.

b. Use Table I of Appendix B to find the probability that x … 10. Verify this probability using MINITAB.

c. Use Table I to find the probability that x 7 12.

d. Use Table I to find the probability that x = 11. Verify this probability using MINITAB.

e. Graph the probability distribution of x, and locate the interval m { 2s on the graph.