Create a set of 8 observations with mean 14.

Create a set of 6 observations with mean 10.

Create a set of 6 observation with mean 8.

Create a set of 5 observations with mean 8.

Create data of 8 observations with mean 10.

Create a collection of 8 observations with median 12.

Create a set of data of 7 observations with 88 as the median.

One set of 100 observations has the mean 15 and another set of 150 observation has the mean 16. Find the mean of 250 observation by combining the two sets of given observations.

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))

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

If the S.D. of a set of observations is 8 and if each observation is divided by -2, the S.D. of the new set of observations will be (a) -4 (b) -8 (c) 8 (d) 4