RRB Group D 24-Sep-2018 Shift 1 Solved Paper

Question : 57 of 100

Marks: +1, -0

There are four numbers in a set. The mean of the three smallest ones is

19,

while the mean of the three greatest ones is

23 .

What is the range of the data set.

Solution:

Let us suppose

A, B, C

and

D

are four numbers,
ATQ, Mean of the three smallest ones

(A+B+C)=19 \×3=57

.
Again mean of the three greatest ones

(B+C+D)=23 \×3=69

A+B+C=57

{B}+{C}+{D}=69

─ ─ ─ ─ ─ ─ ─ ─ ─

{D}-{A}=12

\∴

Range of the data

=12

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