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    Mean, Range, Standard Deviation, Variance and Skewness Problem Set

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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.

    105. Listed below are the commissions earned ($000) last year by the sales representatives at the Furniture Patch.
    $ 3.9 $ 5.7 $ 7.3 $10.6 $13.0 $13.6 $15.1 $15.8 $17.1 17.4 17.6 22.3 38.6 43.2 87.7

    a. Determine the mean, median, and the standard deviation.
    b. Determine the coefficient of skewness using Pearson's method.
    c. Determine the coefficient of skewness using the software method.

    254. A telephone number consists of seven digits, the first three representing the exchange. How many different telephone numbers are possible within the 537 exchange?

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