Disscussion

    20) A history teacher assigns letter grades on a test according to the following scheme:
    A: Top 10%
    B: Scores below the top 10% and above the bottom 60%
    C: Scores below the top 40% and above the bottom 20%
    D: Scores below the top 80% and above the bottom 10%
    F: Bottom 10%
    Scores on the test are normally distributed with a mean of 68 and a standard deviation of 12.1. Find the numerical limits for each letter grade. 20) ______
    A) A: Above 83
    B: Between 71 and 83
    C: Between 58 and 70
    D: Between 53 and 57
    F: Below 53
    B) A: Above 79
    B: Between 71 and 79
    C: Between 58 and 70
    D: Between 53 and 57
    F: Below 53
    C) A: Above 79
    B: Between 71 and 79
    C: Between 58 and 70
    D: Between 55 and 57
    F: Below 55
    D) A: Above 83
    B: Between 74 and 83
    C: Between 58 and 73
    D: Between 53 and 57
    F: Below 53

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