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Chapter 5: Q 1.3. Solving Equations Using a Graphing Utility (page 303)
If is the event that the person chosen has normal cholesterol (below 200 mg/dl), what鈥檚 P(C)?
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Fill 鈥檈rr up! In a recent month, of automobile drivers filled their vehicles with regular gasoline, purchased midgrade gas, and bought premium gas. Of those who bought regular gas, paid with a credit card; of customers who bought midgrade and premium gas, and , respectively, paid with a credit card. Suppose we select a customer at random.
Draw a tree diagram to represent this situation. What鈥檚 the probability that the customer paid with a credit card? Use the four-step process to guide your work.
Sampling senators Refer to Exercise 67. Are events D and F independent? Justify your answer.
Crawl before you walk (3.2) At what age do babies learn to crawl? Does it take longer to learn in the winter, when babies are often bundled in clothes that
restrict their movement? Perhaps there might even be an association between babies鈥� crawling age and the average temperature during the month they first try to crawl (around six months after birth). Data were collected from parents who brought their babies to the University of Denver Infant Study Center to participate in one of a number of studies. Parents reported the birth month and the age at which their child was first able to creep or crawl a distance of four feet within one minute. Information was obtained on infants ( boys and girls). Crawling age is given in weeks, and average temperature (in 掳F) is given for the month that is six months after the birth month. Analyze the relationship between average crawling age and average temperature. What do you conclude about when babies learn to crawl?
Box of chocolates According to Forrest Gump, 鈥淟ife is like a box of chocolates. You never know what you鈥檙e gonna get.鈥� Suppose a candy maker offers a
special 鈥淕ump box鈥� with chocolate candies that look the same. In fact, of the candies have soft centers and 6 have hard centers. Choose of the
candies from a Gump box at random.
(a) Draw a tree diagram that shows the sample space of this chance process.
(b) Find the probability that one of the chocolates has a soft center and the other one doesn鈥檛.
At the gym Suppose that of adults belong to health clubs, and of these health club members go to the club at least twice a week. What percent of all adults go to a health club at least twice a week? Write the information given in terms of probabilities, and use the general multiplication rule.
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