Question: Question 5 5 pts Let X1 and X2 be random sample of normal distribution with mean 1 and 2 and variance 3 and 5

Question 5 5 pts Let X1 and X2 be random sample of

Question 5 5 pts Let X1 and X2 be random sample of normal distribution with mean 1 and 2 and variance 3 and 5 respectively. What is the moment generating function of Y = 3X +2X2? Note that in the answers below exp(x) = e the exponential function with argument x. O exp(7t+9.5*(t^2)) O exp(7t+47*(t^2)) exp(7t + 19*(t^2)) exp(7t + 23.5*(t^2)) Question 6 5 pts Find a 95% confidence interval for the mean time required for an oil change at a local company. A random sample of N = 30 oil changes is taken and it is computed that the mean time to change oil is 17.2 minutes with a sample standard deviation of 6 minutes. (14.95,19.44) (15.05,19.34) O (15.33,19.06)

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