The percentage of marks obtained by students of a class in mathematics are : 64, 36, 47, 23, 0, 19, 81, 93, 72, 35, 3, 1. Find their mean.


Given:

The percentage of marks obtained by students of a class in mathematics are 64, 36, 47, 23, 0, 19, 81, 93, 72, 35, 3, 1.

To do:

We have to find the mean.

Solution:

We know that,

Mean $\overline{X}=\frac{Sum\ of\ the\ observations}{Number\ of\ observations}$

Therefore,

Mean marks $\overline{X}=\frac{64+36+47+23+0+19+81+93+72+35+3+1}{12}$

$=\frac{474}{12}$

$=39.5$

Hence, the mean is $39.5$ marks.    

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Updated on: 10-Oct-2022

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