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16 October, 15:54

The scores on a psychology exam were normally distributed with a mean of 57 and a standard deviation of 9. A failing grade on the exam was anything 2 or more standard deviations below the mean. What was the cutoff for a failing score? Approximately what percentage of the students failed?

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  1. 16 October, 16:13
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    Given:Sample mean = 57

    Standard Deviation = 9

    score of 59

    we go to our standard formula:

    (score - mean) / sd = z

    (59 - 57) / 9 = z

    2/9 = z

    0.2222 = z

    Failing score cutoff would be equal to Mean - 2SD = 67 - 2 (9) = 48 is failing score cutoff.
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