You have surveyed 100 randomly selected people 18 to 35 years old, and 100 randomly selected people 36 years old and over to determine the rates of smartphone use in different age groups. The results are shown in the table below. Use this table to answer questions 1 - 5 below. Smartphone No smartphone Total 18-35 36 and over Total 80 64 144 20 36 56 100 100 200 Assuming we are selecting a single individual at random from this group, what is the probability that: 1. The individual uses a smartphone? 2. The individual is 18 to 35 and uses a smartphone? 3. The individual uses a smartphone or is 36 and over? 4. The individual uses a smartphone, given that they are 18 to 35? 5. The individual is 18 to 35, given that they use a smartphone? All airline passengers must pass through security screenings, but some are subjected to additional searches as well. Some travelers who carry laptops wonder if that makes them more likely to be searched. Data for 230 passengers aboard a cross-country flight are summarized in the table shown. Does it appear that being subject to an additional search is independent of carrying a laptop computer? Explain. Searched? Yes No Laptop 70 64 134 No laptop 30 66 96 Total 100 130 230