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ANSWERS FOR FREQUENCY DISTRIBUTION AND CENTRAL TENDENCY EXERCISES FROM CLASS 4 #1 a) Mean = 40.15 b) Variance = 166.92 #2 a) X f cf c% 80 – 84 3 50 100 75 – 79 4 47 94 70 – 74 3 43 86 65 – 69 6 40 80 60 – 64 3 34 68 55 – 59 6 31 62 50 – 54 5 25 50 45 – 49 7 20 40 40 – 44 6 13 26 35 – 39 3 7 14 30 – 34 4 4 8 b) Here are the 4 steps for making a histogram: 1- Make a frequency table 2- Put the values along the bottom of the page, from left to right, from lowest to highest. For a grouped frequency table, the histogram is of the intervals, and you mark the center of each interval—the point half way between

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