Question

The marks (out of 100) obtained by a group of students in a science test are 85, 76, 90, 85, 39, 48, 56, 95, 81 and 75. Find the:

1. Highest and the lowest marks obtained by the students.
2. Range of the marks obtained.
3. Mean marks obtained by the group.

Answer 1

The marks obtained by the group of students in a science test can be arranged in an ascending order as follows.

39, 48, 56, 75, 76, 81, 85, 85, 90, 95

i. Highest marks = 95

Lowest marks = 39

ii. Range = 95 − 39

= 56

iii. Mean marks = `(85+ 76+90+85+39+48+56+95+81+75 )/10`

= `730/10`

= 73