5-1 Probability Distributions 215 x P(x) 0 0.012 1 0.079 2 0.215 3 0.311 x P(x) 0 0.104 1 0.351 2 0.396 3 0.149 x P(x) 0 0.358 1 0.439 2 0.179 3 0.024 x P(x) 0 0.023 1 0.145 2 0.340 3 0.354 4 0.138 P(x) Left 0.636 Right 0.304 No preference 0.060 8. Password Protection Results from a survey of mobile device users are listed in the table, where x is the number in a group who said that they do not use passwords to protect their mobile devices (based on data from a Kaspersky Lab survey). 9. Online Courses College students are randomly selected and arranged in groups of three. The random variable x is the number in the group who say that they take one or more online courses (based on data from Sallie Mae). 14. Self-Driving Vehicle Groups of adults are randomly selected and arranged in groups of three. The random variable x is the number in the group who say that they would feel comfortable in a selfdriving vehicle (based on a TE Connectivity survey). 13. Printer Usage Households are randomly selected and partitioned into groups of four. For those groups, the random variable x is the number of households with a printer (based on data from the Consumer Technology Association). 12. Fear of Heights The table lists results from a survey of 285 subjects who were asked, “Are you afraid of heights in tall buildings?” The results are from USA Today. Response x P(x) Yes 0.46 No 0.54 11. Cell Phone Use In a survey, cell phone users were asked which ear they use to hear their cell phone, and the table is based on their responses (based on data from “Hemispheric Dominance and Cell Phone Use,” by Seidman et al., JAMA Otolaryngology—Head & Neck Surgery, Vol. 139, No. 5). 10. Genetic Disorder Five males with an X-linked genetic disorder have one child each. The random variable x is the number of children among the five who inherit the X-linked genetic disorder. x P(x) 0 0.031 1 0.156 2 0.313 3 0.313 4 0.156 5 0.031
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