RRB Group D 19-Sep-2018 Shift 1 Solved Paper

Question : 42 of 100

Marks: +1, -0

The mean of three numbers is 21. The range of this data set is 19 while the difference between the two smallest numbers is 5. The greatest of the three numbers is

28
26
27
29
None of the above

Validate

Solution:

\;{ {a}+ {b}+ {c}}/{3}=21

{a}+ {b}+ {c}=63

......... (1)
Range

= {c}- {a}=19

............. (2)
and

= {b}- {a}=5

............ (3)
Equation

(2)+

Equation (3)

\;\; =b+c-2 a=24

........... (4)
Eqn.

(1)-

Eqn. (4)

3 a=39

a= 13
c = 19 + a = 19 + 13 = 32

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