A typing-competency test yields scores with x = 80.0 and s = 10.0, and a histogram shows

Question:

A typing-competency test yields scores with x = 80.0 and s = 10.0, and a histogram shows that the of the scores is roughly bell-shaped. Use the empirical rule to answer the following:
a. What percentage of the scores should fall between 70 and 90?
b. What percentage of the scores should fall within 20 points of the mean?
c. About 99.7% of the scores should fall between what two values? (The mean of 80.0 should be midway between those two values.) Distribution
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