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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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