class 7

  NCERT Solutions for Class 7 Maths Chapter 3  NCERT Solutions for Class 7 Maths Chapter 3 Data Handling Exercise 3.1 Ex 3.1 Class 7 Maths Question 1. Find the range of heights of any ten students of your class. Solution: Let us have the heights of 10 students are as follows: 140 cm, 141.5 cm, 138 cm, 150 cm, 161 cm, 138 cm, 140.5 cm, 135.5 cm, 160 cm, 158 cm Here, minimum height = 135.5 cm Maximum height =161 cm ∴ Range = Maximum height – Minimum height = 161 cm — 135.5 cm = 25.5 cm Hence, the required range = 25.5 cm. Ex 3.1 Class 7 Maths Question 2. Organise the following marks in a class assessment in a tabular form. 4, 6, 7, 5, 3, 5, 4, 5, 2, 6, 2, 5, 1, 9, 6, 5, 8, 4, 6, 7 (i) Which number is the highest? (ii) Which number is the lowest? (iii) What is the range of the data? (iv) Find the arithmetic mean. Solution: Let us form a frequency distribution table: (i) 9 is the highest marks. (ii) 1 is the lowest marks. (iii) Range = Max. marks – Min. marks = 9 – 1 = 8 (iv)...