6th Grade Math Textbook, Fundamentals

Frequency

Store Hours

Customers at Store

10–11:5912–1:592–3:594–5:596–7:59

45

40

35

30

25

20

15

10

5

0

The tallest bar

represents the

busiest 2-hour

interval.

The shortest bar

represents the least

busy 2-hour interval.

Lesson 8-6 for exercise sets. Chapter 8 219

Practice & Activities

Age Group Frequency

10–19 84

20–29 68

30–39 40

40–49 12

50–59 5

60–69 2

70–79 0

The frequency table shows how many people, by age group, shopped
for musical instruments at a single store during one week.

Use the data in the table to make a histogram.
Then answer the questions.

1.Which age group purchased the greatest number

of musical instruments? How does the histogram

show this?

2.What percent of shoppers who shopped at the store

during that week are ages 50 to 59?

3.What is the range of the frequencies?

Make a frequency chart and histogram for the given data.

4.A newspaper listed the top 20 best-selling novels

and indicated how many weeks each had been

on the best-sellers list. The number of weeks

on the list for those novels is as follows:

7, 23, 38, 1, 2, 2, 5, 45, 14, 41, 28, 16, 17, 19, 9, 13, 6, 5, 9, 11

To group the number of weeks, use the categories 1–10,

11–20, 21–30, 31–40, and 41–50. Which grouping contains

the median number of weeks on the best-sellers list?

5.Discuss and Write How did you use the data in your frequency

chart in question 4 to construct the histogram?

Label equal spaces along the horizontal axis.

Draw bars without any gaps in between to show the

frequency for each interval of data. Do not omit any

interval, even if an interval has a frequency of 0.

Write a title for the graph.

The histogram clearly shows the change in volume

of customer traffic throughout the day.

• During which time interval is the volume of customer
  traffic about twice as great as it is during the interval
  from 4:00 P.M. to 5:59 P.M.? Explain how you know.
  The volume of customer traffic is about twice as great
  from 12:00 to 1:59 P.M. The top of the bar for the
  interval from 4:00 P.M. to 5:59 P.M. is at about 17, and
  the top of the bar for the interval from 12:00 to
  1:59 P.M. is at 35, which is about twice as great as 17.