A distribution of tests scores is unimodal and symmetric with mean = 60 points and standard

Question:

A of tests scores is unimodal and symmetric with mean = 60 points and standard deviation s = 10 points.
a. Estimate the percentage of scores that are between 30 and 90 points.
b. How many standard deviations apart are the scores 30 and 90 points?
c. Use parts (a) and (b) to explain why if there are no outliers, it makes sense that the range of the scores is approximately 6s. Distribution
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