2) Suppose that the cumulative distribution function (CDF) of the distance, X in km, salmon swim upriver to spawn is given by 0 for :1: 5 O, FAR?) = 03:2 forO 50. where the river headwaters are 50 km inland. a) Find and sketch the PDF of X. (Note: you must rst determine the required value of c.) b) Find the mean and standard deviation of the spawning distance