Chapter 5.5, Problem 20E

Approximating Binomial Probabilities In Exercises 19-26, determine whether you can use a normal distribution to approximate the binomial distribution. If you can, use the normal distribution to approximate the indicated probabilities and sketch their graphs. If you cannot, explain why and use a binomial distribution to find the indicated probabilities. Identify any unusual events. Explain.

20. Public Wi-Fi A survey of U.S. adults found that 54% of those who use the Internet access Wi-Fi networks in public places. You randomly select 100 U.S. adults who use the Internet. Find the probability that the number who access Wi-Fi networks in public places is (a) at least 65, (b) fewer than 50, and (c) more than 60. (Source: Pew Research Center)