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Math Help - Two questions: Histogram and normal distribution.

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    Two questions: Histogram and normal distribution.

    Another set of questions since mathematics really isn't my area... Sorry, but I need help again.

    In a frequency distribution histogram, if I've to list the frequency of each occurring number from 1 to 7, but the frequency for 5 = 0, should I leave a blank area on the histogram or just half the height and double the width for a 4 -> 6 bar?

    Normal distribution
    Mean: 100
    Standard deviation: 20

    1. What score separates the top 40% from the bottom 60% of the distribution?
    2. What is the minimum score needed to be in the top 5%?
    3. What scores form the boundaries for the middle 60%?

    Being sick really isn't helping me here. My eyes are watery and blurry and I've to hold a tissue to my nose half the time.
    Last edited by mr fantastic; December 15th 2009 at 05:46 PM. Reason: Questions moved from another thread.
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