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Quantitative Ability preparation for TNPSC

Shared from TNPSC Mock - 1 on Apr 09, 2016 10:44 PM

The mean and standard deviation of 10 observations are 45 and 3, respectively. If each observation is increased by 4, the respective changed mean and standard deviation will be

 
45 and 3
41 and 3
49 and 3
45 and 7
49 and 7

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C

49 and 7

Just a guess

C

45,3