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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=∑xifi∑fi Now, Marks(xi)Frequency(fi)xifi8721747832345315398219692218497197812162652130983294762152TOTAL201676 Mean =∑xifi∑fi =167620 =83.8 Thus, mean of the marks obtained by 20 students in a classroom is 83.8.

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