Mean and standard deviation of 100 observations were found to be 40 and 10 respecitly .If
Channel: Doubtnut
Date: 2020-01-19

Mean and standard deviation of 100 observations were found to be 40 and 10 respecitly .If at the time of calculation two observations were wrongly taken as 30 ans 70 in place of 3 and 27 respectively , then find the correct standard deviation.