Question15. Records show that the probability of seeing a hawk migrating on a day in September is about $35 \%$. What is the minimum number of days a person must watch to be at least $96.8 \%$ sure of seeing one or more hawks migrating? a) 5 b) 6 c) 7 d) 8 e) 9
Use the table below for numbers 16 and 17. The following data are based on a survey taken by a consumer research firm. In this table. $x=$ number of televisions in a household and $\%=$ percentages of U.S. households. \begin{tabular}{|l|l|l|l|l|l|l|} \hline $\boldsymbol{x}$ & 0 & 1 & 2 & 3 & 4 & 5 or more \\ \hline$\%$ & $3 \%$ & $11 \%$ & $28 \%$ & $39 \%$ & $12 \%$ & $7 \%$ \\ \hline \end{tabular}
16. What is the probability that a household selected at random has less than three televisions? a) 0.81 b) 0.39 c) 0.42 d) 0.58 e) 0.19
17. The probability that a manufacture part at a plant is defective is $\mathbf{0 . 0 2}$. The plant has manufactured 300 parts. Let $r$ be the random variable representing the number of defective parts. What is the probability that exactly five parts are defectlve? Use the Poisson distribution for the binomial. a) 0.0268 b) 0.9732 c) 0.8394 d) 0.001 e) 0.1606
18. Compute the expected value of the $x$ distribution (round televisions of five or more to five). a) 15 b) 2.67 c) 1.28 d) 1.13 e) 3.1
19. The number of points scored in a soccer game is an example of what type of variable? a) Discrete b) Continuous c) Both A and B
20r. A business has seven locations to choose from and wishes to rank only the top three locations. How many different ways can this be done? a) 5,040 b) 840 c) 420 d) 210 e) 35
21r. Suppose a researcher assigns the numbers to possible study participants and then chooses every $10^{\text {th }}$ subject after randomly selecting a starting value. This is an example of what type of sampling? a) Random b) Systematic c) Stratified d) Cluster e) Convenience