Calculate the mean using step deviation method.

62

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63

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64

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65.3

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Solution

The correct option is C $65.3$
Answer:-
Class interval width (i) = 20

No. of pages
X No. of articles
F $u = \frac{X - A}{i}$ Fu
20 3 -2 -6
40 6 -1 -6
60 = A 9 0 0
80 12 1 20
$Σ f = 30$ $Σ f u = 8$
Mean = $A + \frac{Σ f u}{Σ f} = 60 + \frac{8}{30} \times 20 = 65.3$
D) 65.3

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No. of pages X	No. of articles F	$u = \frac{X - A}{i}$	Fu
20	3	-2	-6
40	6	-1	-6
60 = A	9	0	0
80	12	1	20
	$Σ f = 30$		$Σ f u = 8$

Calculate the mean using step deviation method.

The correct option is C 65.3Answer:- Class interval width (i) = 20No. of pagesX No. of articlesFu=X−Ai Fu 20 3-2 -640 6-1-660 = A 90080 12120 Σf=30 Σfu=8 Mean = A+ΣfuΣf=60+830×20=65.3D) 65.3

The correct option is C $65.3$
Answer:-
Class interval width (i) = 20

No. of pages
X No. of articles
F $u = \frac{X - A}{i}$ Fu
20 3 -2 -6
40 6 -1 -6
60 = A 9 0 0
80 12 1 20
$Σ f = 30$ $Σ f u = 8$
Mean = $A + \frac{Σ f u}{Σ f} = 60 + \frac{8}{30} \times 20 = 65.3$
D) 65.3