Chapter 12.2, Problem 4P

To determine

To find:a cumulative frequency table for the given data.

Answer to Problem 4P

Amount	Frequency	Cumulative frequency
$0-3$	6	6
$4-7$	3	9
$8-11$	2	11
$12-15$	4	15

Explanation of Solution

Given:

The given data shows battery life, in hours, for different brands of batteries.

  $12131515792271121015$ .

Calculation:

As the given data is $12131515792271121015$ .

Now, the data is first arranged in increasing order. Then,

  $01122257791112131515$

The minimum data value is 0, and the maximum value is 15.

Divide the data in to four intervals.

Therefore, create a frequency table:

Amount	Frequency
$0-3$	6
$4-7$	3
$8-11$	2
$12-15$	4

Cumulative frequency: Add the frequency of each interval to the frequencies of all the previous interval.

The cumulative frequency table for the given data is:

Amount	Frequency	Cumulative frequency
$0-3$	6	6
$4-7$	3	9(6+3)
$8-11$	2	11(9+2)
$12-15$	4	15(11+4)