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Chapter 5: Q 85. (page 331)
Fill 鈥檈r up Refer to Exercise 83. Given that the customer paid with a credit card, find the probability that she bought premium gas.
The probability that she bought premium gas is
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In government data, a household consists of all occupants of a dwelling unit. Choose an American household at random and count the number of
people it contains. Here is the assignment of probabilities for your outcome:
The probability of finding people in a household is the same as the probability of finding people. These probabilities are marked ??? in the table of the distribution. The probability that a household contains 3 people must be
(a) (b) (c) (d) (e) between and, and we can say no more. 
During World War II, the British found that the probability that a bomber is lost through enemy action on a mission over occupied Europe was Assuming that missions are independent, find the probability that a bomber returned safely from missions.
Spinning a quarter With your forefinger, hold a new quarter (with a state featured on the reverse) upright, on its edge, on a hard surface. Then flick it with your other forefinger so that it spins for some time before it falls and comes to rest. Spin the coin a total of 25 times, and record the results.
(a) What鈥檚 your estimate for the probability of heads? Why?
(b) Explain how you could get an even better estimate.
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?
Due to a hit, A very good professional baseball player gets a hit about of the time over an entire season. After the player failed to hit safely in six straight at-bats, a TV commentator said, 鈥淗e is due for a hit by the law of averages.鈥� Is that right? Why?
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