The following table, reproduced from Exercise 2.14, gives the frequency distribution of the gallons of gasoline purchased by all customers on one day at a certain gas station.
Number of Gallons Number of Customers
0 to less than 4............. 31
4 to less than 8............. 78
8 to less than 12.............. 49
12 to less than 16............ 81
16 to less than 20............ 117
20 to less than 24............ 13
a. Prepare a cumulative frequency distribution.
b. Calculate the cumulative relative frequency and cumulative percentage for each class.
c. Find the percentage of customers who purchased less than 16 gallons.
d. Draw an ogive for the cumulative percentage distribution.
e. Using the ogive, estimate the percentage of customers who purchased less than 10 gallons.