Question

The average marks of a group of 60
students in statistics are 70 and for
another group of 40 students the
average marks are 80. The average marks
of combined group is,
O 70
O 72
O 73
O 74​

Answer 1

Average of 70 students = 80.

Hence total marks of all the 70 students = 70x80 = 5600

Out of these 70, average of 40 students = 75

Hence total marks of these 40 students = 40x75 = 3000.

So the total marks of the remaining 30 students = 5600-3000 = 2600

Hence the average of the remaining 30 students = 2600/30 = 86.66

Answer 2

Step-by-step explanation:

answer is 86.66 please like