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Mean and variance of 20 observation are 10 and 4. It was found, that in place of 11, 9 was taken by mistake find correct variance.

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Mean and variance of 20 observation are 10 and 4. It was found, that in place of 11, 9 was taken by mistake find correct variance.

(1) 3.99 

(2) 3.98 

(3) 4.01 

(4) 4.02

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1 Answer

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Answer is (1) 3.99

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