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26 December, 04:31

Michael took 12 tests in his math class. His lowest score was 78. His highest score was 98. On the 13th test, he earned a 64. Put a check in the correct box to indicate whether the value of each statistic below for his test scores increased, decreased, or cannot be determined when the last score was added.

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  1. 26 December, 05:41
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    When the last score is added, the average test scores would have decreased. The reason is that the lowest test score prior to this being added was 78. When you add a value less than your lowest, it will drop the average.
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