2005 iTest Problems/Problem 8
Problem
Joe and Kathryn work part-time jobs at the local mall to make some money for college. Joe works at GameStop, while Kathryn works at Bath and Body Works. However, neither of them usually ever leaves on pay day without spending a healthy portion of their check at their own store, especially angering Joe’s parents, who think video games are for Neanderthals or children under 
.
Joe makes 
an hour, while Kathryn makes 
an hour. Both work 
hours a week. Every week, Joe has a 
probability of purchasing a used 
video game, and Kathryn has a 
probability of purchasing a 
skin moisturizer. Find the expected value, in dollars, of their combined weekly “take-home pay.” (Take-home pay is total pay minus in-store spending.)
Solution 1
Since Joe makes 8 dollars per hour, he makes 
per week. Kathryn makes 
per week. Joe's expected spending per week, is 
, and Kathryn's expected spending per week is 
. Thus, their combined expected take-home pay is 
.
See Also
| 2005 iTest (Problems, Answer Key) | ||
| Preceded by: Problem 7 |
Followed by: Problem 9 | |
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