4. [-/1.42 Points] DETAILS SAPCALCBR1 6.6.009. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Suppose the average waiting time for a customer's phone call to be answered by a company representative is five minutes. What is the median waiting time? (Assume that the walt time has an exponential distribution. Round your answer to one decimal place.) Additional Materials ebook MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER DETAILS PREVIOUS ANSWERS SAPCALCBR1 6.6.012lol for each question part is used for your score. 1. [0.71/1.42 Points] DETAILS PREVIOUS ANSWERS SAPCALCBR1 6.6.003. Let f(x) = =xV 36 - x2 for 0 S x $ 6 and f(x) = 0 for all other values of x. (a) Is f a probability density function? O yes O no (b) Find P(X