4. In a single throw of pair of coins, what is the probability that only one head will appear? a. b. d. 9isw 5. In a single throw of a pair of dice, how many sample point(s) will have a sum of 12? а. 0 b. 1 с. 2 d. 3 6. Which graph shows the probability distribution of a random variable where the probabilities (y-axis) of the sample points (x-axis) are represents by vertical bars. a. Bar graph b. Frequency polygon c. Probability histogram d. Scatter graph 7. Which function assigns a probability value to a discrete random variable and is defined by a discrete probability distribution? a. Probability mass function b. Density function c. Discrete function d. Function of x and y

9. Suppose three fair coins are flipped. Let a random variable count the number of tails. a.) Find the probability distribution. b.) Find the mean of the probability distribution. c.) Find the variance and the standard deviation of the probability distribution.

6. Employers often require their employees to be subjected to random drug testing. Suppose that 5% of employees use a certain type of drug. Drug testing accuracy varies. From years of data collection it is known that those who use this type of drug have ½ 94% chance of testing positive. It is also known that 3% of non-drug users (of the certain type of drug) still test positive. a.) Fill out a probability cross tabulation. b.) If the employee tests positive for a certain drug, what's the probability that the employee uses the drug? c) If the employee tests positive for a certain drug, what's the probability that the employee does NOT use the drug?

20. A coin has an equal probability of coming up heads or tails when tossed. Suppose a game is played where a player is awarded 10 points if a pair of tosses both come up heads, 8 points if they both come up tails, and 2 points if the result is 1head and 1 tail. What is the expected value of the score for a pair of tosses? GeoGebra Graphing Calculator     a.5.55 b.5.95 c.6.36 d.6.7