The lifetime of a certain equipment can be modelled by a random variable X and is given by the probability density function
f(x)= (xe^(-x/10)) / (100), x>=0. What is the probability that the lifetime of the equipment exceeds 20? Also find the mean and variance of x.
f(x)= (xe^(-x/10)) / (100), x>=0. What is the probability that the lifetime of the equipment exceeds 20? Also find the mean and variance of x.
