Question
The following figure portrays the appearance of a distribution of efficiency ratings for employees of Nale...
The following figure portrays the appearance of a distribution of efficiency ratings for employees of Nale Nail Works Inc.: 20 30 40 50 60 70 80 90 100 110 120 130 Efficiency rating a. Estimate the mean efficiency rating. (Round the final answer to 1 decimal place.) Mean efficiency rating b. Estimate the standard deviation. (Round the final answer to the nearest whole number.) Standard deviation c. About 68% of the efficiency ratings are between what two values? (Round the final answers to 1 decimal place.) About 68 % of the efficiency ratings are between and . d. About 95% of the efficiency ratings are between what two values? (Round the final answers to 1 decimal place.) About 95% of the efficiency ratings are between and
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