Question

[28] QUESTION 6 The following data show the Thirty vehicles filled up with petrol at a certain filling station in Pretoria amount of petrol (in litres) supplied to each vehicle 20 12 15 32 30 15 31 25 13 35 27 18 24 28 36 17 25 23 18 37 25 22 27 21 23 24 16 13 31 11 6.1 Set up a grouped frequency table for this data, using class widths of 5 litres, with 10 litres as the lower limit of the lowest class (Use the headings class limits, tally, class midpoint and frequency) (5) 62 (1) 621 Give the class limits of the class with the highest frequency (1) 622 What is the class midpoint of the class with the lowest frequency? 6 2 3 Write down the formula or expression you would use, or describe in some or other way the method you would use, to calculate the authmetic mean of the given data (You do not need to do the calculation) 6 2 4 Give the modal class of the given data (10)

Answer 1

Answer - 6 .6.1 Frequency table - Class Limits Frequency I Tally HITI Class midpoints л 1111 26.5 л 10 - 15 16-21 27 28 -33 111 1 35.5 л 11H л Genn og 34-39 111 5 3.5 л 6.2 1) Class limit of class with highest frequency - 2) 53.5 22-27 3 arithmetic mean = at azt azt ... tan ie sum of all data no. of data 4 Modal class = 22-27