Question

The number of students in four classes A, B, C, D and their respective mean marks obtained by each of the class are given below: Class A, Class B, Class C, Class D and number of students 10, 40, 30 and 20 and airthmatic mean 20, 30, 50 and 15 the combined mean of marks of four classes together will be​

Answer 1

Answer:

10*20+40*30+30*50+20*15 = 200+1200+1500+300/100 = 3200/100 = 32

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