Problems Solved

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.