Question

The final marks in mathematics of 30 students are as follows:

53,61,48,60,78,68,55,100,67,90
75,88,77,37,84,58,60,48,62,56
44,58,52,64,98,59,70,39,50,60

If 40 is the pass mark how many have failed?

Answer 1

First of all arrange the marks as groups ascending order means lowest number to highest number

Group	Ascending order
30 to 39	37,39
40 to 49	44,48,48
50 to 59	50,52,53,55,56,58,58,59
60 to 69	60,60,60,61,62,64,67,68
70 to 79	70,75,77,78
80 to 89	84,88
90 to 100	90,98,100

If 40 is the pass mark then
number of the failed students =2