Q. 64.6( 9 Votes )

# 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.

Answer :

(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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