find the mean of the following frequency distribution by step-distribution method class 40-50,50-60,60-70,70-80,80-90,90-100 frequency 5,10,20,9,6,2
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class frequency xi fixi
40-50 5 5 25
50-60 10 15 150
60-70 20 35 700
70-80 9 44 396
80-90 6 50 300
90-100 2 52 104
fi= 52 fixi= 1675
mean = fixi/fi = 1675/52
= 32.211
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