Chapter 5: Q. T5.8 (page 357)
In a class, there are 18 girls and 14 boys. If the teacher selects two students at random to attend a party with the principal, what is the probability that the two students are the same sex?
a.
b.
c.
d.
e.
The probability is
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In a sample ofstudents, say they are vegetarians. Of the vegetarians, eat both fish and eggs, eat eggs but not fish, and eat neither. Choose one of the vegetarians at
random. What is the probability that the chosen student eats fish or eggs?
a.
b.
c.
d.
e.
If I toss a fair coin five times and the outcomes are , then the probability that tails appear on the next toss is
a. .
b. less than .
c. greater than .
d. .
e. .
Cell phones The Pew Research Center asked a random sample of adult cell-phone owners from the United States their age and which type of cell phone they own: iPhone, Android, or other (including non-smartphones). The two-way table summarizes the data.
Suppose we select one of the survey respondents at random.
Three pointers The figure shows the results of a basketball player attempting many
point shots. Explain what this graph tells you about chance behavior in the short run and
long run.
Mac or PC? A recent census at a major university revealed that 60% of its students mainly used Macs. The rest mainly used PCs. At the time of the census, of the school’s students were undergraduates. The rest were graduate students. In the census, of respondents were graduate students and used a Mac as their main computer. Suppose we select a student at random from among those who were part of the census and learn that the person mainly uses a Mac. Find the probability that the person is a graduate student.
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