the first part of the question is attached!
(a) For what value of c is f(x) a valid density?
(b) What is the average number of copies sold by a platinum album?
(c) What is the probability that a platinum album sells exactly 650,000 copies?
(d) What is the probability that a platinum album sells between 450 and 750 thousand copies?
Extracted text: An album is considered to be "certified platinum" if they sell more than 500,000 copies. Let X be the total number of copies of an album sold, in thousands. Let f(x) 400 and Sx = [500, 0) = C x3
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