AP EAMCET Engineering 21 Apr 2019 Shift 2 Paper

For a group of 100 students, the mean \ and the standard deviation σ1 of their marks were found to be 40 and 15 respectively. Later it was observed that the scores 40 and 50 were misread as 30 and 60 respectively. If the mean and the standard deviation with the corrected observations of the scores, are

−

x2

and σ2 respectively, then