mean marks obtanied by a student in his five subject are 15. in eng. he secures 8 marks, in eco. 12, in maths 18, and in commerce 9. find out the marks he secured in statistics.

Let, the marks obtained in Statistics be y.

We know, 

A.M. = Σx/N

Now,

A.M. = 15, N = 5

Σx = 8 + 12 + 18 + 9 + y

⇒15 = (8 + 12 + 18 + 9 + y)/5

⇒ y = 28

Thus, the marks obtained in statistics is 28.

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