The lives (in hours of continuous use) of 100 randomly selected flashlight batteries are: Interval~               Frequency~ 6.95- 7.45                2 7.45- 7.95                8 7.95- 8.45               19 8.45- 8.95               39 8.95- 9.45               20 9.45- 9.95               10 9.95- 10.45              2 a.) Find the mean of the battery lives. ______ hours. b.) Find the standard deviation of the battery lives. ______ hours.  (Type an integer or a decimal.  Round to two decimal places.)

Big Ideas Math A Bridge To Success Algebra 1: Student Edition 2015
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ISBN:9781680331141
Author:HOUGHTON MIFFLIN HARCOURT
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Chapter11: Data Analysis And Displays
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The lives (in hours of continuous use) of 100 randomly selected flashlight batteries are:

Interval~               Frequency~

6.95- 7.45                2

7.45- 7.95                8

7.95- 8.45               19

8.45- 8.95               39

8.95- 9.45               20

9.45- 9.95               10

9.95- 10.45              2

a.) Find the mean of the battery lives. ______ hours.

b.) Find the standard deviation of the battery lives. ______ hours.  (Type an integer or a decimal.  Round to two decimal places.)

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