Answer: 18% of 500 is 90.
BD + MD = BM
Since D is the midpoint of the line
BD + MD = BM
7 + 16 = BM
23 = BM
To create your histogram you could use the following intervals and frequencies.
5-9 (4)
10-14 (3)
15-19 (5)
20-24 (3)
You would create a frequency on your y-axis that goes to 5. Make sure the bars are touching each other because the data is consecutive (in order).
Label your x-axis #of customers.
Label y-axis frequency
Title: How many customers are shopping at lunch time?
Get a common factor which would be 12.... the equation is now 4/12 + 3/12 which is 7/12