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in Statistics by (33.5k points)
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Mean of 100 observations is 40. The 9th observation is 30. If this is replaced by 70 keeping all other observations same, find the new mean.

(A) 40.6 

(B) 40.4 

(C) 40.3 

(D) 40.7

1 Answer

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by (33.1k points)
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Best answer

New mean =  \(\cfrac{4000-30+70}{100}\)

= 40.4 

Correct option is (B) 40.4

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