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Q1
:
If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60, then the average marks of all the students is:
A
None of these
B
53.33
C
55
D
54.68
Solution
ANS:
B
- 54.68
Required average
=
55 x 50 + 60 x 55 + 45 x 60
55 + 60 + 45
=
2750 + 3300 + 2700
160
=
8750
160
= 54.68
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