Discussion
Which of the following options is equal to the average of first 10 natural numbers?
Answer: C
The average is 5.5.
The first 10 natural numbers add up to 55, and 55 divided by 10 is 5.5.
55 is the sum, not the mean, 0.5 and 5 do not equal the mean.
The mean of the first n natural numbers is (n + 1)/2. For n = 10 this is 11/2 = 5.5. It is also the middle of the list between the fifth and sixth numbers, 5 and 6, which is another way to see that it is not 5.
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