1. Which situation describes a discrete random variable? A The probability of being dealt three hearts in a 5-card hand. B The number of girls in a family of four children. C The expected number of red cars in a parking lot. D The probability of winning a prize in a lottery. 2. What is the expectation for this probability distribution? P(x) 0.23 0.41 0.19 4 0.17 A 0.25 C 0.575 B 1.0 D 2.3 3. A spinner has 8 sectors, each of which is sized based on their labelled number, from 1 to 8. Which statement is correct? A This is a uniform distribution because it is a single trial. B This is a uniform distribution because each outcome is equally likely. C This is a non-uniform distribution because there is more than one trial. D This is a non-uniform distribution because the sectors have different sizes and therefore different probabilities. 4. In which situation are the outcomes not equally likely? A The sum of the results on two dice. B A random number generated from 1 to 50 C A card being drawn from a standard deck. D An MP3 player randomly selecting a song from a playlist.12 5 X8 42 8. The expression represents the probability in a hypergeometric distribution. What are the values of 20 7 r, a, and n? A r=7, a = 12, n = 20 C r= 8, a = 12, n = 20 B r= 12, a = 7, n = 20 D r= 7, a= 8, n = 12 9. A five-card hand is dealt from a standard deck. Which expression represents the calculation for the expected number of face cards? 5 x 52 C 5x 12 12 52 B 12 x 52 D 52 5 5 x 12