The lives (in hours of continuous use) of 100 randomly selected flashlight

batteries are:

a. Find the mean of the battery lives. hrs

(Type an integer or a decimal. Round to two decimal places.)

Interval

6.95-7.45

7.45-7.95

7.95-8.45

8.45-8.95

8.95-9.45

9.45-9.95

9.95-10.45

...

Frequency

2

10

19

34

20

13

2