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Mean = (4x2 +0x5)/4 = 8÷4 = 2
Σfx = 2x1+3x2+5x3 = 2+6+15 = 23
Mean = 450 ÷ 90 = 5
Σf = 4+6+5+3 = 18
Mean = 37 ÷ 6 = 6.166... → 6.17
Frequencies weight values by occurrence for true mean
Mean = (8×28+7×30+3×32+2×34)/20 = 598/20 = 29.9
f = 5; Mean = 62/12 = 5.1667 ≈ 5.17
Mean = 598 ÷ 20 = 29.9
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