A discrete variable Q, extra inventory units, has integer values from 1 to 10. When sampled 100 times, the following observed probability distribution was obtained:
 FIGURE 1.png)
(a) Determine the sample average and standard deviation by hand.
(b) Determine the sample average and standard deviation by spreadsheet.
(c) Determine the values 1 and 2 standard deviations from the mean. Of the 100 sample points, how many fall within these two ranges?
 FIGURE 4.png)
(b) Average and standard deviation values are shown.
 ANSWER.png)
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