Average
Average (or mean or arithmetic mean) can be calculated by the simple formula,
Example 1. What is the average of: 4, 3, 8 and 5?
Solution
Here, total numbers = 4. So,
Example 2. What is the average of: 2, 9, 11, 3, 0, and 5?
Solution
ere, total numbers = 6. So,
Example 3. The average of 1, 3, 7, 4, 2, 0, and x is 3. What is the value of x ?
Solution
Here, total numbers = 7. So,
Example 4. Mr. Stuart obtained 40 marks in Mathematics, 70 in Statistics and 60 in Physics. What average marks he obtained?
Solution
Here, total number of subjects = 3. So,
Example 5. The average age of Anna, Stuart, Kate and their father is 25 years. If the age of Anna, Stuart and Kate is 18, 21 and 24 respectively. What is the age of their father?
Solution
Here, total number of people = 4. So,
