# practice questions for a test in 12 hrs

### Question Description:

practice questions for a test in 12 hrs 1 answer below » q1 3 4 5 only Document Preview: Page 1 of 4 Econometrics 211/511 Practice Mid Term Test NON PROGRAMMABLE CALCULATORS ALLOWED. 1. The discrete random variable X has probability distribution given by X: -1 0 1 2 3 p(X=x): 0.2 a 0.1 a 0.2 a. Find the value of a. b. Write down E(X) c. Find the variance of X. 2. Consider the random variable Y = X1 – X2 where X1 and X2 are random variables representing the outcomes of rolling two identical six-sided fair dice. a. Write down the probability View complete question » q1 3 4 5 only Document Preview: Page 1 of 4 Econometrics 211/511 Practice Mid Term Test NON PROGRAMMABLE CALCULATORS ALLOWED. 1. The discrete random variable X has probability distribution given by X: -1 0 1 2 3 p(X=x): 0.2 a 0.1 a 0.2 a. Find the value of a. b. Write down E(X) c. Find the variance of X. 2. Consider the random variable Y = X1 – X2 where X1 and X2 are random variables representing the outcomes of rolling two identical six-sided fair dice. a. Write down the probability mass function for Y b. Compute P(Y <0), P(Y <3) and P(-1 Attachments: Practice-MST-....pdf View less » Jan 20 2014 01:19 AM