The average marks of 14 students was 71. It was later found that the marks of one of the students has been wrongly entered as 42 instead of 56 and of another as 74 instead of 32. What is the correct average?
Sami Aslam
a) 67 b) 68 c) 69 d) 71
SSC CHSL-2015
69. Solution Average = 71 Corrected average = 71 - [(42+74-56-32)/14] = 71-2 =69
