Arithmetic MCQ 7 (Average of given numbers)
MCQ 7: The average of first 10 odd numbers is_
a) 11 b) 10 c) 12 d) 17
Solution:
Odd numbers are those which are not divisible by 2 .
so, first ten odd numbers are;
1,3,5,7,9,11,13,15,17,19
To find their average we use;
\[ Average = \frac{Sum Of Terms}{Total Number Of Terms} \]
Here sum of terms i-e first ten odd numbers = 1+3+5+7+9+11+13+15+17+18+19=100
Number of terms i-e odd numbers = 10
So,
\[ Average = \frac{100}{10}=10 \]
So, the option b is correct
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