The time at which the mailman delivers the mail to Ace Bike Shop follows a normal distribution with mean 2:00 P.M. and standard deviation of 15 minutes.
a. What is the probability the mail will arrive after 2:30 P.M.?
b. What is the probability the mail will arrive before 1:36 P.M.?
c. What is the probability the mail will arrive between 1:48 P.M. and 2:09 P.M.?
Question 2
In a random sample of 200 registered voters, 120 indicated they are Democrats. Develop a 95 confidence interval for the proportion of registered voters in the population who are Democrats.