1. Which of the following is a discrete random variable? a.The average amount of electricity consumed b. The number of patients in a hospitall c. The amount of paint used in repainting a building d. The average weight of female athletes 2. If two coins are tossed. which is not possible value of the random variable fo the number of heads? a. 0 b. 1 c. 2 d. 3 3. Which of the following is not a true statement? a. The value of a random variable could be zero b.Random variables can only have one value c.The probability of the value of a random variable could be zero 1. Ihe sum of all the probabilities in a probability distribution is always equal to one 4. Which formula gives the probability distribution shown by the table x 2 6 PX 1/21/31/6 a. PX=1/X b 1. PX=X/6 c. PX=6/X d. PX=1/6 5. If PX=X/6 , what are the possible values of X for it to be a probability distribution? a.0.2.3 b. 1,2,3 c.2,3,4 d. 1,1,2 For numbers 6-8 , refer to the probability distribution shown below 6. What is the mean of the probability distribution? a.1.5 b. 1.2 c. 1.6 d. 1.8 7. What is the variance of the probability distribution? a.0.75 b. 1.00 c. 1.25 d. 0.50 8. What is the standard deviation of the probability distribution? a.1.00 b. 0.87 c. 1.12 d. 0.71 For numbers 9-10 refer to the probability distribution shown below 246 PX 1/5 175 1/5 1/5 is 9. What is the mean of the probability distribution? a.1.5 b. 2.0 c. 3.5 d. 4.0
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