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Questions  >>  CBSE XII  >>  Math  >>  Model Papers
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Using the properties of determinants prove that $\begin{vmatrix} x+y & x & x \\ 5x+4y & 4x & 2x \\10x+8y & 8x & 3x \end{vmatrix}=x^3$

The regression equation of X and Y is 3y-5x+108=0.  If the mean value of Y is 44 and t
he variance of X were 9/16 th
of the variance of Y.  Find the mean value of X and the correlation coefficient.
commented Dec 13, 2018 by geraldkissa

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