# 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

**Solution:**

We use the basic formulae of statistics like mean and range to solve the questions.

Mean marks = Sum of marks/Total no.of students

Marks obtained by the group of students = 85, 76, 90, 85, 39, 48, 56, 95, 81, 75

(i)Highest marks obtained by the student = 95 Lowest marks obtained by the student = 39

(ii)Range of the marks = Highest marks – Lowest marks

= 95 – 39

= 56

(iii) Mean marks = Sum of marks

Total no.of students

= (85 + 76 + 90 + 85 + 39 + 48 + 56 + 95 + 81 + 75)/10

= 730/10

= 73

Thus, the mean marks obtained by a group of students are 73.

**Video Solution:**

## 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

### NCERT Solutions Class 7 Maths - Chapter 3 Exercise 3.1 Question 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

i) Highest marks obtained by the student is 39, ii) Range of marks obtained by the students is 56, iii) the mean marks obtained by a group of students are 73