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Q.6 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
(i) highest and the lowest marks obtained by the students.
(ii) range of the marks obtained.
(iii) mean marks obtained by the group.
Answer :

Marks obtained are: 85, 76, 90, 85, 39, 48, 56, 95, 81 and 75 (i) Highest marks = 95 Lowest marks = 39 (ii) Range of the marks = Highest marks – Lowest marks = 95 – 39 = 56
(iii) mean Mark's \(=\frac{sum of all obtained mark}{number of students} \)
$$ \frac{85+76+90+85+39+48+56+95+81+75}{10}=\frac{730}{10}= 73 $$