Suppose that the battery failure time, measure in hours, has probability density function given by: f(x) = 2 / (x +1)3 x?0.
What is the first quartile of X?
Suppose that the diameter of a metal cylinder has a probability density function given by: f(x) = 1.5 - 6( x - 50)2 for 49.5 ? x ? 50.5 mm
What is the variance of the diameter?