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    Normal dist: Empirical rule &Circle graph & Measurement scale

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    1) Using the empirical rule, determine the approximate percentage of a normal distribution that is expected to fall within 1 standard deviation of the mean.

    A. 34%
    B. 50%
    C. 47.5 %
    D. 68%

    2) A department of mathematical sciences has majors in four areas
    Major Number of Majors
    Mathematics 0
    Computer Science 22
    Actuarial Science 15
    Statistics 10
    If a circle graph is constructed for these data, what would be the percentage (to the nearest tenth of a percent) of the graph for each major?

    3) Identify the statement "the number of telephone calls arriving at a switchboard per ten minute period" as an example of:

    a. Nominal
    b. Ordinal
    c. Discrete
    d. Continuous

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    Solution Preview

    1. Answer: D. 68%
    Based on the empirical rule, in a normal distribution 68% of the data will fall within 1 standard deviation of the mean.

    2. Please ...

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