Integers

8 Topics | 2 Quizzes
Fractions and Decimals

8 Topics | 3 Quizzes
Exponents and Powers

4 Topics | 3 Quizzes
Algebraic Equations

6 Topics | 3 Quizzes
Simple Linear Equations

6 Topics | 3 Quizzes
Lines and Angles

4 Topics | 3 Quizzes
Comparing Quantities

6 Topics | 3 Quizzes
The triangle and its properties

8 Topics | 3 Quizzes
Congruence of Triangles

7 Topics | 2 Quizzes
Rational Numbers

5 Topics | 3 Quizzes
Perimeter and Area

7 Topics | 3 Quizzes
Data Handling

9 Topics | 2 Quizzes
Practical Geometry

7 Topics | 1 Quiz
Symmetry

4 Topics | 1 Quiz
Visualising Solid Shapes

4 Topics | 1 Quiz
The mean is the average of the number of observations. To calculate mean we have to divide the sum of the values of the observations by the total number of observations.

**Example**

The score of 8 students in science is given. Find the average score of the students.

25, 28, 23, 24, 29, 35, 42, 48

**Solution**

**Range**

Arithmetic mean lies between the smallest and the largest observation. **A range** is a difference between the largest and the smallest observation.

**Range = Largest Observation – Smallest Observation**

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