Posted by **Pat** on Saturday, January 28, 2012 at 1:41pm.

Suppose that the mean score of an exam was 77 when taken 30 students took it on time with a standard deviation of 2. A makeup of the same exam is given to 6 students. The retakes averaged a score of 83 with a standard deviation of 2.9. What is the average of the test scores?

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