jee-main 2025 Q69

jee-main · India · session2_04apr_shift1 Measures of Location and Spread
Q69. 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) $\sqrt { 3.86 }$ 
Q69. 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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