31A asks you to find the mean and standard deviation of test scores...how can we do this? If we just add up the scores 1-5 we're not considering how many students got each score. So, think of the score as your "value" and the percents are our "probability." So for mean and standard deviation, enter the score in L1, percent (as a decimal) in L2, and do the 1 Var Stat L1,L2.
Good luck!
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