RRB RPF RPSF SI and CONS Model Papers 3 with solutions

Question : 25 of 120

Marks: +1, -0

What is the Arithmetic mean of the first 'n' natural numbers?

Solution:

(a) Arithmetic mean of first ‘n’ natural number

=\text" Sum of 'n' natural number "/\text" Number of observations "

= { ( { n } ) ( { n } + 1 ) }/ { 2 × { n } } = { { n } + 1 }/ { 2 }

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