EPFO 2015 English Medium Solved Paper

Question : 15 of 120

Marks: +1, -0

Four quantities are such that their Arithmetic Mean (A. M.) is the same as the A. M. of the first three quantities. The fourth quantity is

Solution:

Given ,
Arithmetic mean of four quantities =
Arithmetic mean of first three quantities =

x

(let)
Now, sum of first three quantities
= Mean

\times

Total number =

3x

and sum of total four quantities =

4.x

Hence, fourth quantity

= 4x - 3a = x

or
Arithmetic Mean of first three quantities

Go to Question:

Prev Question

Next Question