Exploratory challenge 1/exercises 2–5: computer games
2. create a dot plot of the data from question 1 in the poll: the number of hours per week students in class spend
playing computer or video games
3. consider the chance experiment of selecting a student at random from the students at your school. you are
interested in the number of hours per week a student spends playing games on computers or game consoles.
a. identify possible values for the random variable number of hours spent playing games on computers or game
consoles.
b. which do you think will be more likely: a randomly chosen student at your school will play games for less than
9 hours per week or for more than 15 hours per week? explain your thinking.
c. assume that your class is representative of students at your school. create an estimated probability
distribution for the random variable number of hours per week a randomly selected student at your school
spends playing games on computers or game consoles.
d. use the estimated probability distribution to check your answer to part (b).
4. use the data your class collected to answer the following questions:
a. what is the expected value for the number of hours students at your school play video games on a computer
or game console?
b. interpret the expected value you calculated in part (a).
5. again, assuming that the data from your class is representative of students at your school, comment on each of the
following statements:
a. it would not be surprising to have 20 students in a random sample of 200 students from the school who do
not play computer or console games.
b. it would be surprising to have 60 students in a random sample of 200 students from the school spend more
than 10 hours per week playing computer or console games.
c. it would be surprising if more than half of the students in a random sample of 200 students from the school
played less than 9 hours of games per week.