d the average of first 10 odd numbers is calculate average

# 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

Calculate average

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

There are odd numbers and even numbers and prime numbers.

odd numbers are not divisible by 2,

even numbers are divisible by 2.

prime numbers are only divisible by themselves.

2 is the only even prime number.


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