|
Question 850454: Shanna Washington just got a job at Jake's Joke Shop. The owner gave Shanna a choice of two salary plans for the week. "I can pay you $25 for the week or you can reach into a bag containing some bills, draw two bills and that will be your salary. There are three $1 bills, four $5 bills, one $20 bill, and two $50 bills in the bag. which salary plan would you want?"
"is this some sort of joke?" asked Shanna. "i think i'd rather have the money in the bag!" what are Shanna's chances of earning at least $25 for the week if she decides to take from the bag?
Answer by richwmiller(17219)   (Show Source):
You can put this solution on YOUR website! 3+4+1+2=10 bills
She needs more than a total of $25
There are only two ways to get more than $25
20& 50 or
50& 50
She needs at least one $50 or $20 on the first draw
3/10
on the second draw 2/9
3/10*2/9=6/90=2/45
chances of breaking even are
4/10*3/9=12/90=6/45=2/15
so add 6/45+2/45 to get 8/45 for chances of getting $25 or more
chances for getting less than $25 are pretty high
1-8/45=37/45
|
|
|
| |
