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11 February, 04:20

Scores on a standardized military exam are normally distributed with a mean of 57 and a standard deviation of 9. Consider a group of 4000 military students. Approximately how many students will score less than 66 on the test?

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  1. 11 February, 04:48
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    Use the formula:

    66-57=9 (66 minus the mean of 57)

    9/9 = 1 (standard deviation divided by 9)

    Find 1 on a Z-Score table. This equals. 8413

    .8413 (4000) = 3,365.2 (Z-Score multiplied by the number of total students)

    Can also be 3,366; )
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