Suppose that the following data is the total annual incomes (rounded to thousands) for all 30 staffs in the Department of Mathematics of a university for the year 2014. Staff Annual Income(RM '000)...

Please use excel.

Extracted text: Suppose that the following data is the total annual incomes (rounded to thousands) for all 30 staffs in the Department of Mathematics of a university for the year 2014. Staff Annual Income(RM '000) Staff Annual Income(RM '000) 1 51 16 43 2 70 17 16 3 79 18 15 4 75 19 72 72 20 92 6. 55 21 25 7 25 22 30 8 38 23 24 74 24 46 10 54 25 47 11 37 26 46 12 15 27 45 13 56 28 38 14 17 29 81 15 77 30 49 Construct a grouped frequency distribution for the data using 5 classes.Calculate the relative frequency and percentage for all classes. Clue: The 5 classes are 15-30,31-46,47-62,63-78,79-94 1. Find the measurement of central tendency for this grouped of total annual incomes for all 30 staffs? а. Мean? b. Median? с. Mode?