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:

53.33
54.68
55
None of these

Correct Answer: 54.68

Explanation:

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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