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The following frequency distribution represents the ages of 120 men in a certain locality
Ages(Years) 10-14 15-19 20-24 25-29 30-34 35-39 40-44
No of Men 5 10 18 27 35 16 9
Sum fi= 120
Sum Xi x fi = 3445
Mean = 3445/120 = 28.7083
find first four moments