Question : The average of 10 numbers is 8. If each number is multiplied by 10, then the new average will be:
Option 1: 80
Option 2: 18
Option 3: 8
Option 4: 50
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Correct Answer: 80
Solution : When each number in a set is multiplied by a constant, the average of the set is also multiplied by that constant. The average of the numbers is 8 and each number is multiplied by 10. $\therefore$ The new average = 8 × 10 = 80 Hence, the correct answer is 80.
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Question : The average of 10 numbers is 42. If each number is increased by 5, then what will be the new average?
Option 1: 42
Option 2: 47
Option 3: 92
Option 4: 57
Question : The average of 11 numbers is 8. If every number is tripled, then what will be the new average of the numbers?
Option 1: 8
Option 2: 24
Option 3: 16
Option 4: 32
Question : The average of 21 numbers is 60. If each number is increased by 20, then find the number by which the average is increased.
Option 1: 12
Option 3: 15
Option 4: 20
Question : The average of 20 numbers is 36. If each number is increased by 4, then what will be the new average?
Option 1: 44
Option 2: 46
Option 3: 40
Option 4: 36
Question : The average of ten numbers is 24. If each number is divided by 2, then what will be the new average?
Option 2: 6
Option 3: 20
Option 4: 5
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