There are 3 groups of students, each containing 25, 50 and 25 students respectively. The mean marls obtained by the first two groups are 60 and 55. The combined mean of all the three groups is 58. What is the mean of the marks scored by third group?

(a) 52 (b) 57 (c) 58 (d) 62

There are 3 groups of students, each containing 25, 50 and 25 students respectively. The mean marls obtained by the first two groups are 60 and 55. The combined mean of all the three groups is 58. What is the mean of the marks scored by third group?

(a) 52 (b) 57 (c) 58 (d) 62

1 Answer

127 votes

Let the mean marks of the third group be

Then,

127 votes

127