Question

.The number of students in four classes A, B, C, D and
their respective mean
below
class-A class o
classe class o
No of students-10,40, 30,20
Arithmetic mean- 20,30,50,15
The combined mean of the marks of our
of the marks of our classes together
will be
(a) 32 (b) 50 (c)20 (d) 15​

Answer 1

Answer:

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