8.13 The following density function describes the ran- dom variable X. % 0

8.13 The following density function describes the ran- dom variable X. a. b. c. d. e. 25 10 -x 25 Graph the density function. Find the probability that X lies between 1 and 3. What is the probability that X lies between 4 and 8 ? Compute the probability that X is less than 7. Find the probability that X is greater than 3 .