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Question

Find the average marks obtained by 20 students in a class.

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 A

83.8


Average or the mean value of a given number of observations is the sum of all observations divided by the number of observations. 

Marks(xi)Frequency(fi)xifi8721747832345315398219692218497197812162652130983294762152TOTAL201676

Mean = xififi = 167620 = 83.8 


Mathematics

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