A panel of judges rate 20 science fair exhibits as shown. The judges decide that the top rating should be 100, so they add 6 points to each rating.

a. What are the mean and the standard deviation of the ratings before adding 6 points?
b. What are the mean and the standard deviation of the ratings after adding 6 points?
c. What do you notice about the change in the mean? In the standard deviation?

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Exhibit number Rating Exhibit number Rating 79 81 94 92 68 79 71 83 89 92 85 12 13 14 15 16 17 18 19 20 86 83 89 90 92 84 10 73