book Maths Puzzle Numerical Ability

What is mean deviation?define, examples & uses?

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book Other Question

The vector v has an initial point P and terminal point Q. Write v in the form ai+bj; that is, find its positive vector.
P=(-2,-1);Q=(6,-2) What is the equation in standard form of the ellipse that has a center(-1,4), foci at (-1,8) and (-1,0), and the length of the minor axis is the sq. root of 3?