Question : The sum of 10 numbers is 686. What is their average?
Option 1: 67.5
Option 2: 65.5
Option 3: 68.6
Option 4: 66.6
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Correct Answer: 68.6
Solution : The sum of 10 numbers is 686. $\therefore$ The average of these 10 numbers $=\frac{\text{Sum of all the observations}}{{\text{Total number of observations}}}=\frac{686}{10}= 68.6$ Hence, the correct answer is 68.6.
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Question : The sum of 11 numbers is 660. Find their average.
Option 1: 66
Option 2: 60
Option 3: 10
Option 4: 80
Question : The average of 4 numbers is 45. The average of the first two numbers is thrice the average of the other two numbers. What is the sum of the first two numbers?
Option 1: 122
Option 2: 105
Option 3: 125
Option 4: 135
Question : The sum of 12 numbers is 1080. What is the average of these 12 numbers?
Option 1: 72
Option 2: 54
Option 3: 90
Option 4: 84
Question : The average of nine numbers is 20. If two of these numbers are removed, then the average becomes 18. What is the sum of the two numbers that are removed?
Option 1: 56
Option 2: 58
Option 3: 54
Option 4: 52
Question : The sum of the squares of 3 consecutive positive numbers is 365. The sum of the numbers is:
Option 1: 30
Option 2: 33
Option 3: 36
Option 4: 45
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