7. A mobile game designer is curious about people buying additional coins in the game
to progress through the levels in the game. After a beta test including 100 players,
the designer determined the probability that a randomly chosen beta tester played
fewer than 3 hours per week and purchased fewer than 10 coins is 0.45.
purchased fewer than
10 coins
purchased at least 10
coins
played fewer than 3 hours played more than 3 hours
per week
per week
0.45
to tal
a. Among the beta testers, 45 of them played fewer than 3 hours per week and
purchased fewer than 10 coins. Describe the group of people represented by
the remaining 55 beta testers.
total