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1. Students in a college intro stats class have taken 3 tests before the final exam. The statistics from the first 3 tests from 3

1. Students in a college intro stats class have taken 3 tests before the final exam. The statistics from the first 3 tests from 3 different classes are shown in the table below. What would be the mean and the standard deviation of the sum of the test scores for the 3 classes?

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