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Question
A boy scored the following marks in various class tests during a terminal exam, each test being marked out of 20.
17, 15, 16, 7, 10, 14, 12, 19, 16, 12
Find his average mean marks.
Solution
Mean = `(sumx)/"N"`
Avg. mean marks
= `(17 + 15 + 16 + 7 + 10 + 14 + 12 + 19 + 16 + 12)/(10)`
= `(138)/(10)`
= 13.8.
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