A dealer's profit in units of $5,000 on a new automobile is a random variable X having density function
f(x,y) = 2(1-x) for -1 <= x <= 1
a) Find the vaiance in the dealer's profit.
b) Demonstrate that chebyshev's inequality holds for k = 2 with the density function above.
c) What is the probability that the profit exceeds $500?
a) E(2(1-x)) = -4
What is f(x) in this problem?
b) How can I show that it holds true?