A work-standards expert observes the amount of time required to prepare a sample of 10 business letters in an office with the following results listed in ascending order to the nearest minute: 5, 5, 5, 7, 9, 14, 15, 15, 16, 18. Determine the   (i)         Range (ii)        Middle 70 percent for the sample. (iii)      Sample variance of the preparation-time data

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