# Compute the range, the standard deviation, and the variance.

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30. Determine the estimated mean of the following frequency distribution.

Class Frequency

0 up to 5 2

5 up to 10 7

10 up to 15 12

15 up to 20 6

20 up to 25 3

93. Each person who applies for an assembly job at Carolina Furniture, Inc. is given a mechanical aptitude

test. One part of the test involves assembling a dresser based on numbered instructions. A sample

of the lengths of time it took 42 persons to assemble the dresser was organized into the

following frequency distribution.

Length of Time

(minutes) Frequency

2 up to 4 4

4 up to 6 8

6 up to 8 14

8 up to 10 9

10 up to 12 5

12 up to 14 2

Compute the range, the standard deviation, and the variance.

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