Dear Student X f fx (X-M)^2 f(X-M)^2 2 1 2 64 64 8 1 8 4 4 10 3 30 0 0 12 5 60 4 20 10 100 72 88 Mean(M) = ∑fx∑fMean(M) = 10010 = 10 SD = ∑f(X-M)2∑f SD = 8810 SD = 8 8 SD = 2 97 Coeffecient of SD = SD MCoeffecient of SD = 2 9710Coeffecient of SD = 0 29 Regards

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Dear Student

X	f	fx	(X-M)^2	f(X-M)^2
2	1	2	64	64
8	1	8	4	4
10	3	30	0	0
12	5	60	4	20
	10	100	72	88

M e a n (M) = \frac{\sum_{} f x}{\sum_{} f} M e a n (M) = \frac{100}{10} = 10

S D = \sqrt{\frac{\sum_{} f {(X - M)}^{2}}{\sum_{} f}} S D = \sqrt{\frac{88}{10}} S D = \sqrt{8.8} S D = 2.97

C o e f f e c i e n t o f S D = \frac{S D}{M} C o e f f e c i e n t o f S D = \frac{2.97}{10} C o e f f e c i e n t o f S D = 0.29

Regards

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