DSE 2004 Doubt plz help

Posted by MohitG on Jun 23, 2014; 11:42am
URL: http://discussion-forum.276.s1.nabble.com/DSE-2004-Doubt-plz-help-tp7593411.html

10 outcomes of a RV were recorded. The sample mean is 0 and variance is 4. It is discovered that two entries were recorded incorrectly: one was recorded as -5 instead of -6 while the other was recorded as 11 instead of 12. Calculate the actual variance. Th answer is given to be 7.4. But somehow I just can't figure out this one. Plz help :(