Q6 of 40 Page 154

The marks obtained by 12 students in a mathematics examination are given below.

48,78,93,90,66,54,83,58,60,75,89,84.


Find (i) the mean of the marks (ii) the mean mark of the students if each student is given 4 grace marks.

(i)



⇒ Mean = 73.17


(ii)


Since, each student got 4 grace marks implies we need to add 4 marks 12 times.




⇒Mean = 77.17


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