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Q.

Find the arithmetic mean of the first 10 odd natural numbers.
 


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a

10

b

11

c

9

d

15 

answer is A.

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Detailed Solution

Concept-To solve this problem, we  first classify the first 20 natural numbers and then settle for 10 natural odd numbers. Finally, calculate the arithmetic mean  using the following formula:
Question Image First ten odd natural numbers are Question ImageTherefore,
Question Image Hence, the correct option is 1.
 
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Find the arithmetic mean of the first 10 odd natural numbers.