1) If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55 and 60, then the average marks of all the students is : A) 53.33 B) 54.68 C) 55 D) None of these Answer: Option BExplanation:Required avrage = $\frac{55\times50+60\times55}{55+60+45}$$=\frac{2750+3300+2700}{160}=\frac{8750}{160}=54.68$
