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.
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Solution
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
1) Highest marks = 95
Lowest marks = 39
2) Range = 95 − 39
= 56
3) Mean marks = `(85+ 76+90+85+39+48+56+95+81+75 )/10`
= `730/10 = 73`
Concept: Arithmetic Mean - Range
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