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Chapter 3 Quiz Started: Apr 28 at 9:31am Quiz Instructions Sections 2-9 D Question 1 1 pts Let X be a random variable with cdf 0, x 30) (round off to second decimal place). D Question 7 1 pts The pdf of X is f (x) = 0.1,3 9). D Question 8 1 pts Let X be a random variable with pdf f (x) = 4e-x , x 20. Find P(0.5 z) = 0.36 (round off to second decimal place). D Question 18 1 pts Suppose the annual amount of snowfall (in megatons) accumulated in a lake follows a gamma distribution with a = 10 and B = 2. Find the mean annual amount of snowfall accumulated in this lake.Question 19 1 pts The proportion of defective electronic items in a shipment has the Beta(3. 3) distribution. Find the pdf of this distribution. 0 f0) = 30(1:2 -2x3 +x\"),0