Question

(D
)
2
.0
In a class test, in mathematics, 10 students scored 75 marks, 12 students scored
60 marks, 8 scored 40 marks and 3 scored 30 marks. The mean of their score is
(approximately).
(A) 57 marks (B) 56 marks (C) 15 marks (D) 54 marks​

Answer 1

mean=10*75+12*60+8*40+3*30

$\div$

10+12+8+3

$=$

750+720+320+90

$\div$

33

$=$

60