A community for students.
Here's the question you clicked on:
 0 viewing
josue88
 3 years ago
A box contains nine $1 bills, eight $5 bills, two $10 bills, and four $20 bills. What is the expectation if one bill is selected?
josue88
 3 years ago
A box contains nine $1 bills, eight $5 bills, two $10 bills, and four $20 bills. What is the expectation if one bill is selected?

This Question is Closed

RitiBahl100
 3 years ago
Best ResponseYou've already chosen the best response.0The first step to doing probability is to count the total number of bills in the box, which in this case is 9+8+2+4 which is 23. Since there are 9 $1 bills, it is 9 out of 23 which could also be written as 9/23 and there's you're answer.

zepdrix
 3 years ago
Best ResponseYou've already chosen the best response.0the word ONE is not representative of the ONE dollar bills in this case, it means a "single" bill is selected.

zepdrix
 3 years ago
Best ResponseYou've already chosen the best response.0But yah Riti has the right idea. So the total number of bills is 23. The expected value of the $1 bills we can represent this way, as Riti explained,\[\large $1\left(\frac{9}{23}\right)\]We'll add to that the value of each other bill as well. This will give us the value we should expect to gain from one bill selection.\[\large $1\left(\frac{9}{23}\right)+$5\left(\frac{8}{23}\right)+$10\left(\frac{2}{23}\right)+$20\left(\frac{4}{23}\right)\] Which ends up giving us an expectation of around $4.74 on a single bill selection.
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.