Let X be the sample mean of a random sample of size n from a uniform distributionon the interval [0, b], and let bb = 2X be an estimator of the upper endpoint b.(a) Demonstrate that bb is an unbiased estimator of b, and find the variance of the estimator.(b) Use bb to estimate b using the following observations: 3.64, 3.76, 2.53, 7.06, 5.71