Life time of flowers in a bouquet is normally distributed with a mean of 6 days and a standard deviation of 1.7 days.
a. what is the probability that one random selected will last more than 7 days?
b. what is the prob that the mean lifetime of 5 bouquets will be less than 5 days?
c. as the sample size increases will the stanard error of the mean go up or down?