f(v) = av²e-bu*, v>0, where a is a constant and b = , with m being the mass of the molecule, T the temperature of the gas, and k Boltzmann's constant. Find the distribution of W = mv² , the kinetic energy of the molecule. Also find the expected value of the kinetic energy. SS
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- EXER 6.3 Find the covariance and the correlation coefficient between X and Y, if X and Y are jointly discrete random variables, with joint PMF given by: SHOW SOLUTIONS X\Y 0 1 6 0 28 6 1 28 2 0 333333 28 28 28 2120 28 0Q4) The probability mass function of Y is f(y) = y/6 for y=1,2,3,4. Find the variance of Y.Each front tire on a particular type of vehicle is supposed to be filled to a pressure of 25 psi. Suppose the actual air pressure in each tire is a random variable-X for the right tire and Y for the left tire, with joint pdf f(x,y) = K(x + y) 20 sx s 30, 20 s y s 30 otherwise (a) What is the value of K? (Enter your answer as a fraction.) K = (b) What is the probability that both tires are underfilled? (Round your answer to four decimal places.) (c) What is the probability that the difference in air pressure between the two tires is at most 2 psi? (Round your answer to four decimal places.) (d) Determine the (marginal) distribution of air pressure in the right tire alone. for 20 sx < 30 (e) Are X and Y independent rv's? O Yes, f(x,y) = fy(x) · fy(y), so X and Y are independent. O Yes, f(x,y) # f(x) · f(y), so X and Y are independent. O No, f(x,y) = f(x) · fly), so X and Y are not independent. O No, f(x,y) # f(x) · fly), so X and Y are not independent.
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