20 17 12 19 19 21 20 | 18 15 22 16 | 16 18 24 11 17 21 19 31 18 19 18 17 18 23 18 | 20 23 22 10 17 16 17 15 21 19 20 20 20 | 18 15 18 18 40 17 18 | 19 19 20 | 16 17 a. Identify all possible lowest (first) class intervals you may use to organize your data. b. Select one of the possible lowest class intervals and prepare a grouped frequency distribution using reasonable width. c. Calculate all measures of central tendency. d. Determine Z score for the following data taken from the above distribution. Treat these scores as part of the above distribution: 18, 15, 40, 12 and 24. e. Determine T - score of the data in d.

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