1. Twelve batteries were tested to see how many hours they would last. The frequency distribution… 1 answer below »

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1. Twelve batteries were tested to see how many hours they would last. The frequency distribution is shown here.

Hours

Frequency

1-3

1

4-6

4

7-9

5

10-12

1

13-15

1

Find

a. Mean

b. Variance

c. Standard deviation

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