# Rec 8B_Discrete Random Variables Part 2-1.docx - STAT 1430...

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STAT 1430 Recitation Discrete R. V. – Part 2 Instructions: For full credit, use proper notation and write out any formulas you use during this recitation (when applicable). Answers without supporting work will not be given full credit. Multiple Choice and True/False: 1.The number of accidents that occur at a certain intersection in a given year is a continuous random variable. a)Trueb)False 2.Suppose X has a distribution with mean 10 and Y has a distribution with mean 20. The mean of X – Y is 30. 3.Which of the following is a NOT a discrete random variable? 4.The table below shows the probability distribution of X. What is the mean of X?x01234P(X = x)0.100.050.150.300.40 5.If X and Yare random variables with X= 5 and Y= 8, then what is 2X-3Y? a)-34b)-14c)14d)34 6.If X and Yare random variables with X= 2 and Y= 8, then what is 2X+3Y?
STAT 1430 Recitation Discrete R. V. – Part 2