# The heights of 10 girls were measured in cm and the results are as follows: 135, 150, 139, 128, 151, 132, 146, 149, 143, 141.

(i) What is the height of the tallest girl?

(ii) What is the height of the shortest girl?

(iii) What is the range of the data?

(iv) What is the mean height of the girls?

(v) How many girls have heights more than the mean height

**Solution:**

We use the basic formulae of mean and range to solve the problems.

(i)The height of the tallest girl =151 cm

(ii)The height of the shortest girl = 128 cm

(iii)Range of the data = Height of tallest girl – Height of the shortest girl

=151 – 128

=23 cm

(iv)Total number of girls =10

Measurement of the heights of 10 girls = 135, 150, 139, 128, 151, 132, 146, 149, 143, 141.

Mean height of the girls = sum of all heights (in mm)/Number of girls

=(135 +150 +139 +128 +151+132 +146 +149 +143 +141)/10

=1414/10

=14.14 cm

(v)Five girls have heights more than the mean height i.e.: 150, 151, 146, 149, 143.

**Video Solution:**

## The heights of 10 girls were measured in cm and the results are as follows: 135, 150, 139, 128, 151, 132, 146, 149, 143, 141. (i) What is the height of the tallest girl? (ii) What is the height of the shortest girl? (iii) What is the range of the data? (iv) What is the mean height of the girls? (v) How many girls have heights more than the mean height

### NCERT Solutions Class 7 Maths - Chapter 3 Exercise 3.1 Question 9

(i)The height of the tallest girl is 151 cm, (ii) The height of the shortest girl is 128 cm, (iii)Range of the data is 23cm. (iv)Mean height of the girls is 14.14cm, (v)Five girls have heights more than the mean height i.e.: 150, 151, 146, 149, 143