Calculate Standard Deviation from the following data: Daily Wages 0 - 10 10 - 20 20 - 30 30 - 40 40 - 50 No. of Workers 2 7 10 5 3
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Correct option is C)
Marks Mid-values(X) f dxi=X−25/10 fdx
i
f dx
i
2
0−10 5 10 −2 −20 40
10−20 15 8 −1 −8 8
20−30 25 15 0 0 0
30−40 35 8 1 8 8
40−50 45 4 2 8 16
Total
45
−12 72
45
72
−
45×45
144
×10
=12.36
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