alleryThe average of the first 10 natural numbers is:
A5.5
B5
C6
D6.5
Answer & Solution
Correct answer: A. 5.5
1. The first 10 natural numbers are 1 through 10.
2. Their sum is 10 x 11 / 2 = 55.
3. The average is the sum divided by the count, so 55 / 10.
4. That gives 5.5.
5. Answering 5 would be taking the middle of 1 to 10 carelessly; with an even count the mean falls between 5 and 6.
_Source: syllabus Maths, Ch 13 'Statistics', S13.2 Mean of Grouped Data_
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