Find the mean of the marks obtained by $30$ students in a school test, marks are: $10, 20, 36, 92, 95, 40, 50, 56, 60, 70, 92, 88, 80, 70, 72, 70, 36, 40, 36, 40, 92, 40, 50, 50, 56, 60, 70, 60, 60 ~and~ 88$

59.2

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57.3

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59.3

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Solution

The correct option is D 59.3
We know that,
Mean = $\frac{Sum~of~marks~obtained~by~students}{Number~of~students}$

Now, mean $= \frac{10 + 20 + 36 + 92 + 95 + 40 + 50 + 56 + 60 + 70 + 92 + 88 + 80 + 70 + 72 + 70 + 36 + 40 + 36 + 40 + 92 + 40 + 50 + 50 + 56 + 60 + 70 + 60 + 60 + 88}{30}$
$= \frac{1779}{30}$
$= 59.3$
Thus, the mean of the marks obtained by $30$ students in a school test is $59.3$ .

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Find the mean of the marks obtained by 30 students in a school test, marks are: 10,20,36,92,95,40,50,56,60,70,92,88,80,70,72,70,36,40,36,40,92,40,50,50,56,60,70,60,60~and~88

The correct option is D 59.3We know that,Mean =Sum~of~marks~obtained~by~studentsNumber~of~students Now, mean =10+20+36+92+95+40+50+56+60+70+92+88+80+70+72+70+36+40+36+40+92+40+50+50+56+60+70+60+60+8830 =177930=59.3Thus, the mean of the marks obtained by 30 students in a school test is 59.3.

Find the mean of the marks obtained by $30$ students in a school test, marks are: $10, 20, 36, 92, 95, 40, 50, 56, 60, 70, 92, 88, 80, 70, 72, 70, 36, 40, 36, 40, 92, 40, 50, 50, 56, 60, 70, 60, 60 ~and~ 88$