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Calculate the standard deviation. Marks - 20 -40, 40 - 80, 80 -100,100-120, 120-140

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Calculate the standard deviation.

Marks Frequency
20 - 40  3
40 - 80 6
80 - 100 20
100 - 120 12
120-140 9

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1 Answer

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Best answer
X f m d(m-80) (d/10)d-1 fd1 fd2
20 -40 3 30 -60 -6 -18 108
40-80 6 60 -30 -3 -18 54
80-100 20 90 0 0 0 0
100-120 12 110 +20 2 24 48
120-140 9 130 +40 4 36 144
50 24 354

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