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Q.

Calculate the mean of the first 20 natural numbers.


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a

13.5

b

10.5

c

4.4

d

93.3 

answer is A.

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Detailed Solution

Concept- Arithmetic progression shall be employed.
The first 20 natural numbers are 1,2,3, 4……...,20
Mean =  sum of natural numbersnumber of natural numbers
          = 21020
          = 10.5
Hence, the correct answer is 1) 10.5.
 
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Calculate the mean of the first 20 natural numbers.