The cost of unleaded gasoline in the Bay Area once followed an unknown distribution with a mean of $4.59 and a standard deviation of $0.10. Sixteen gas stations from the Bay Area are randomly chosen. We are interested in the average cost of gasoline for the 16 gas stations. The

distribution to use for the average cost of gasoline for the 16 gas stations is ~_____(_____, _____).

A sample of 16 small bags of the same brand of candies was selected. Assume that the population distribution of bag weights is normal. The weight of each bag was then recorded. The mean weight was two ounces. The population standard deviation is known to be 0.1 ounce. Construct and interpret a 90% confidence interval for the population mean weight of the candies.