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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