the arthimatic mean of 150 120 250 350 450 550 and 650 is
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The following figures are the heights in cms of 7 children chose at random:
64, 59, 67, 69, 65, 70, 68
Calculate the simple arithmetic mean of the heights by (i) Direct method, (ii) Short-c ut Method, and (iii) Step Deviation Method.
ANSWER:
S.N. Height
(X) Deviation from assumed mean
d=(X − A) d'=di=d2
1
2
3
4
5
6
7 64
59
67
69=A
65
70
68 −5
−10
−2
0
−4
1
−1 −2.5
−5
−1
0
−2
0.5
−0.5
N=7 ∑X=462 Σd=−21 Σd'= −10.5
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