Quantcast

Got Homework?

Connect with other students for help. It's a free community.

  • across
    MIT Grad Student
    Online now
  • laura*
    Helped 1,000 students
    Online now
  • Hero
    College Math Guru
    Online now

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

delicious49 Group Title

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? A.$6.48 B.$8.48 C.$5.48 D.$7.48

  • one year ago
  • one year ago

  • This Question is Open
  1. asfdgl Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    answer: A Guy With More Money Than Me.

    • one year ago
  2. 221emily Group Title
    Best Response
    You've already chosen the best response.
    Medals 0

    lol that's good!!^^^^^

    • 11 months ago
  3. SithsAndGiggles Group Title
    Best Response
    You've already chosen the best response.
    Medals 1

    There's a total of 23 bills, with the following probabilities of selecting a particular denomination: \[P($1)=\frac{9}{23}\\P($5)=\frac{8}{23}\\ P($10)=\frac{2}{23}\\P($20)=\frac{4}{23}\] If \(X\) denotes the random variable for bill denomination, then \(X\) can take on any value from \(\{1,5,10,20\}\). So, if \(x\) is one of the values of \(X\) and \(f(x)\) is the probability of a particular \(x\), the expected value is \[E(X)=\sum_{\text{all }x}x~f(x)=1\cdot\frac{9}{23}+5\cdot\frac{8}{23}+10\cdot\frac{2}{23}+20\cdot\frac{4}{23}\approx6.48\]

    • 11 months ago
    • Attachments:

See more questions >>>

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
  • 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.

This is the testimonial you wrote.
You haven't written a testimonial for Owlfred.