Question: In the last presidential election, 39% of the registered voters in a certain city actually cast ballots.
(A) In a random sample of 20 registered voters from that city, what is the probability that exactly 8 voted in the last presidential election?
(B) Verify by the rule-of-thumb test that the normal distribution with mean 7.8 and standard deviation 2.18 is a good approximation of the binomial distribution with
n = 20 and p = .39
(C) For the normal distribution of part (B), P(x = 8) = 0. Explain the discrepancy between this result and your answer from part (A).