The two regression lines are x + 2y = 10 and 2x + y = 11. What is the mean of x?
Correct answer C. 4
Explanation
Regression lines meet at (x̄, ȳ). Solving x + 2y = 10 and 2x + y = 11 together gives x = 4 and y = 3, so x̄ = 4.
Answer checked How we write and check questions
Discussion