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Question

Find the mean of the marks obtained by 20 students in a classroom.

MarksFrequency872783531982922971812652983762


A

81.8

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B

82.8

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C

83.8

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D

83.4

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Solution

The correct option is C

83.8


We know that,
Average or the mean value of a given number of observations is the sum of all observations divided by the number of observations.
Mean=xififi

Now,
Marks(xi)Frequency(fi)xifi8721747832345315398219692218497197812162652130983294762152TOTAL201676

Mean
=xififi
=167620
=83.8

Thus, mean of the marks obtained by 20 students in a classroom is 83.8.


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