For 50 students of a class the regression equation of marks in Statistics (X) on marks in Accountancy (Y) is 3Y - 5X + 180 = 0. The mean marks in of Accountancy is 50 and variance of marks in statistics is of the variance of marks in Accountancy. Find the mean marks in statistics and the coefficient of correlation between marks in the two subjects when the variance of Y is 25.

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