Question

4. If AM of 2 observations is 5 and AM of another 3 observations is 6. the AM of the combined series of 5 observations is:​

Answer 1

Answer:

X bar 1 = 10

n1 = 7

X bar 2 = 5

n2 = 3

Combined mean will be :

X c =( n1 * X bar 1 + n2 * X bar 2) / n1+n2

= (10*7 + 5*3)/10 = 8.5