The following figure portrays the appearance of a distribution of efficiency ratings for employees of Nale Nail Works Inc.: Number of ratings 27 39 51 63 75 87 99 111 123 135 147 159 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 andThe ages of a sample of Canadian tourists flying from Toronto to Hong Kong were: 30, 42. 34, 52, 61, 46. 39, 55, 76. 7'2 a. Compute the range. Range E b. Compute the mean deviation. (Round the mean deviation to 2 decimal places.) Mean deviation |:| c. Compute the standard deviation. {Round the standard deviation to 2 decimal places.) Standard deviation |:| d. Using Chebyshev's theorem, at least what percentage of the observations must be within 2.3 standard deviations of the mean? Verify. {Round the final answer to the nearest whole number.} Percent of the observations |:| '36 e. Using the Empirical Rule, about 95% ofthe values would occur between what values? {Round the final answers to 2 decimal places} Between and