Question

Two random variables x and y have the following regression equations -

3x + 2y – 26 = 0

6x + y – 31 = 0

then, the mean values of x and y are respectively:

A 7, 4 Correct Answer Incorrect Answer
B 6, 4 Correct Answer Incorrect Answer
C 4, 7 Correct Answer Incorrect Answer
D 4, 6 Correct Answer Incorrect Answer

Solution

3x + 2y – 26 = 0 6x + y – 31 = 0 The means of X and Y will satisfy the above two equations. So, solving the above two equations we get, Xbar = 4 Ybar = 7

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