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Recent questions tagged q7-3

Find the mean and variance for the following probability density functions $f(x) = \left\{ \begin{array}{l l} xe^{-x}, & \quad \text{if $x$$>$0}\\ 0, & \quad \text{otherwise} \end{array} \right.$

asked Apr 20, 2013 by poojasapani_1

1 answer

Find the equation to the chord of contact of tangents from the point $(5 , 3 )$ to the hyperbola $4x^{2}-6y^{2}=24$

asked Apr 13, 2013 by poojasapani_1

1 answer

If $X=\begin{bmatrix}3 & 1 & 1\\5 & 2 & 3\end{bmatrix}$ and $Y=\begin{bmatrix}2 & 1 & 1\\7 & 2 & 4\end{bmatrix}$, find a matrix $Z$ such that $X+Y+Z$ is a zero matrix.

asked Mar 4, 2013 by sreemathi.v

1 answer

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