The mean of a set of 20 observations is 8 and of another set of 30 observations is 10. The mean of combined set is

The mean of a set of 20 observations is 8 an another set of 30 observations is 10. The mean of combined set is ________.

The mean of a set of 12 observations is 10 and another set of 8 observations is 12. The mean of combined set is ______.

10 is the mean of a set of 7 observations and 5 is the mean of a set of 3 observations. The mean of a combined set is given by

10 is the mean of a set of 7 observations and 5 is the mean of a set of 3 observations, the mean of the combined set is

10 is the mean of a set of 7 observations and 5 is the mean of a set of 3 observations, the mean of the combined set is

Observe the following statements : (A) : 10 is the mean of a set of 7 obervations and 5 is the mean of a set of 3 observations. The mean of a combined set is 9. (R ) : If bar(x)_(i)(i = 1,2,…,k) are the means of k - series n_(i)(I = 1,2,3,…,k) respectively, then the combined or composite mean is bar(x) = (n_(1)bar(x)_(1) + n_(2) bar(x)_(2) + ...+ n_(k)bar(x_(k)))/(n_(1)+n_(2)+...+n_(k))

Observe the following statements : (A) : 10 is the mean of a set of 7 obervations and 5 is the mean of a set of 3 observations. The mean of a combined set is 9. (R ) : If bar(x)_(i)(i = 1,2,…,k) are the means of k - series n_(i)(I = 1,2,3,…,k) respectively, then the combined or composite mean is bar(x) = (n_(1)bar(x)_(1) + n_(2) bar(x)_(2) + ...+ n_(k)bar(x_(k)))/(n_(1)+n_(2)+...+n_(k))

The mean of 5 observations is 60, the mean of 10 observations is 30 and the mean of 15 observations is 20. The mean of all the 30 observations is (a)20quad (b) 25quad (c) 30 (d) 40

Create a set of 5 observations with mean 8.

Create a set of 6 observation with mean 8.