NCHMCT JEE 2021 Question Paper with solutions for online practice

Question : 68 of 200

Marks: +1, -0

A student was asked to find the arithmetic mean of the following 12 numbers

3,11,7,9,15,13,8

19,17,21,14

and

x

.
He found the mean to be 12 . The value of

x

will be

Solution:

Arithmetic mean

=\;{\;\text " Sum of total numbers "\;}/{\;\text " Total number of terms "\;}

3+11+7+9+15+13+8+19

12=\;{+17+21+14+x}/{12}

144=137+x

⇒ \;\; x=144-137

∴ \;\; x=7

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