The mean and standard deviation of a set of values are 5 and 2 respectively. If 15 is added to each value, then what is the coefficient of variation for the new set of values ?

What is the equation of the ellipse having foci (±2, 0) and the eccentricity 1/2?

What is the ratio in which the point C(2, 20/7) divides the line joining the…

What is the equation of the circle which passes through the points (3, -2) and…

The two circles x² + y² = r² and x² + y² – 10x +…

If the three consecutive vertices of a parallelogram are (-2, -1), (1, 0) and (4,…