Problem 5. Please construct confidence intervals using the information below. a. An owner of a gas station would like to estimate the mean number of gallons of gasoline sold at the station. Assume the number of gallons sold follows the normal distribution with a population standard deviation of 2.3 gallons. Among a random sample of 60 sales she finds that the mean number of gallons sold is 8.6. What is the 95% confidence interval for the population mean (hint: use the z table)