jee-main 2024 Q69

jee-main · India · session2_06apr_shift1 Measures of Location and Spread
The mean and standard deviation of 20 observations are found to be 10 and 2, respectively. On rechecking, it was found that an observation by mistake was taken 8 instead of 12 . The correct standard deviation is
(1) 1.8
(2) 1.94
(3) $\sqrt { 3.96 }$
(4) $\sqrt { 3.86 }$ 
The mean and standard deviation of 20 observations are found to be 10 and 2, respectively. On rechecking, it was found that an observation by mistake was taken 8 instead of 12 . The correct standard deviation is\\
(1) 1.8\\
(2) 1.94\\
(3) $\sqrt { 3.96 }$\\
(4) $\sqrt { 3.86 }$
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