Suppose that70%of all registered voters in a certain state favor banning the release of information from exit polls in presidential elections until after the polls in that state close. A random sample of25 registered votersis to be selected. Letx= numberof registered voters in this random sample who favor the ban. (Use Table 9 inAppendix A. Round your answers to three decimal places.)

(a) What is the probability that more than 20 voters favor the ban?

P(x> 20) =

(b) What is the probability that at least 20 favor the ban?

P(x20) =

(c) What are the mean value and standard deviation of the number of voters who favor the ban?

Mean

Standard deviation