1.

Explain the combined mean.

Answer»
  • If the number of observations and mean of two or more groups are given, then the mean of the combined group is called the combined mean. It is denoted by x̄c.
  • If the number of observations and mean of two or more groups are given, then the mean of the combined group is called the combined mean. It is denoted by x̄c.

Suppose, k groups having the observations n1, n2,…,nk have means respectively x1, x2,…. xk, then their combined mean is obtained as follows :
x̄c = \(\frac{n_1x¯_1+n_2x¯_2+…+n_kx¯_k}{n_1+n_2+…+n_k}\)


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