Find mean of the following data: (x) 10 15 20 25 30 35 40 (f) 4 6 8 18 6 5 3

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Mean = €fx / € f = ( 40+90+160+450+180+175+120) / ( 4+6+8+18+6+5+3) = 1215/50 =243
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(10x4 + 15x6 + 20x8 + 25x18 + 30x6 + 35x5 + 40x3 ) / (4+6+8+18+6+5+3) = 40 + 90 + 160 + 450 + 180 + 175 + 120 / 50 = 1215 / 50 = 24.30
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