Question

If n1 = 100, n2 = 150,x1 = 50, x2=40,
01 = 5, 02 = 6 then combined mean is
A) 22
B) 38
C) 55
D) 44​

Answer 1

Answer:

= (100 x 10 + 150 x 10.9/100 +150) = 10.54.