Class Interval |
Frequency |
0-under 5 |
6 |
5-under 10 |
8 |
10-under 15 |
17 |
15-under 20 |
23 |
20-under 25 |
18 |
25-under 30 |
10 |
30-under 35 |
4 |
1. The
owner of a fast-food restaurant ascertains the ages of a sample of customers.
From these data, the owner constructs the frequency distribution shown.
For each Class Interval of the Frequency distribution, determine the class
midpoint, the relative frequency, and the cumulative frequency.
What does the relative frequency tell the fast-food restaurant owner about
customer ages?
Answer
Class Interval |
Frequency |
Class Midpoint |
Relative Frequency |
Cumulative Frequency |
0-under 5 |
6 |
2.5 |
0.070 |
6 |
5-under 10 |
8 |
7.5 |
0.093 |
14 |
10-under 15 |
17 |
12.5 |
0.198 |
31 |
15-under 20 |
23 |
17.5 |
0.267 |
54 |
20-under 25 |
18 |
22.5 |
0.209 |
72 |
25-under 30 |
10 |
27.5 |
0.116 |
82 |
30-under 35 |
4 |
32.5 |
0.047 |
86 |
Totals |
86 |
|
1.000 |
|
This tells the fast-food
restaurant owner that his/her most frequent patrons are those in the age range
from 10 year olds to just under 25 year olds.