Boaters at Springs Creek Marina have the option to rent fishing rods. The table below shows the number of boat owners that rented fishing rods last Labor Day weekend. The marina wants to compile some summary statistics for the weekend.

a. How many boat owners were there on that Labor Day weekend?
b. Write the spreadsheet formula that was used to calculate the amount in cell B7.
c. Write the spreadsheet formula that was used to find the mean.
d. Write the spreadsheet formula that was used to calculate the amount in cell D5.
e. Find the variance for the data set. Round to the nearest hundredth.