Question

The lives​ (in hours of continuous​ use) of 100 randomly selected flashlight batteries​ are:       6.95−7.45 1      ...

The lives​ (in hours of continuous​ use) of 100 randomly selected flashlight batteries​ are:

      

6.95−7.45

1
     

7.45−7.95

9
     

7.95−8.45

20
     

8.45−8.95

36
     

8.95−9.45

21
     

9.45−9.95

12
     

9.95−10.45

1

a. Find the mean of the battery lives.

b. Find the standard deviation of the battery lives.nothing

hrs

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

Math   Advanced-Math   
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