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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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