Question: For data xij , i = 1, . . . ,m, j = 1, . . . , n, show that x. m =xilm =

For data xij , i = 1, . . . ,m, j = 1, . . . , n, show that

x. m =xilm = xjln i=1 j=1

x. m =xilm = xjln i=1 j=1

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