Question : What is the average of the first 10 even numbers?
Option 1: 12
Option 2: 10
Option 3: 13
Option 4: 11
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Correct Answer: 11
Solution : The first 10 even numbers are 2, 4, 6, 8, 10, 12, 14, 16, 18, and 20. Average of a number = $\frac{\text{Sum of all the observations}}{{\text{Total number of observations}}}$ So, the average of these ten numbers $=\frac{2 + 4 + 6 + 8 + 10 + 12 + 14 + 16 + 18 + 20}{10} = \frac{110}{10} = 11$ Hence, the correct answer is 11.
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