# Question: Twelve batteries were tested to see how many hours they

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

Hours Frequency

1â€“3 ......1

4â€“6 ......4

7â€“9 ......5

10â€“12 .....1

13â€“15 .....1

a. Mean

b. Modal class

c. Variance

d. Standard deviation

Hours Frequency

1â€“3 ......1

4â€“6 ......4

7â€“9 ......5

10â€“12 .....1

13â€“15 .....1

a. Mean

b. Modal class

c. Variance

d. Standard deviation

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