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Statistics sum to solve

class intervals fi xi fixi
0−10 2 5 10
10−20 7 15 105
20−30 10 25 250
30−40 15 35 525
40−50 20 45 900
50−60 16 55 880
60−70 6 65 390
70−80 4 75 300
Total 80   3360

Mean = ∑ifixi∑ifi = 336080 = 42

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