- If 4y = 15 + 6x is the regression line of y on x, and coefficient of correlation between x and y is 0.9, then regression coefficient of x on y is equal to _______.

- If 4y = 15 + 6x is the regression line of y on x, and coefficient of correlation between x and y is 0.9, then regression coefficient of x on y is equal to _______.
1). 0.54
2). 0.45
3). 0.81
4). 0.72

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