A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • one year ago

A bag has 1 red marble, 4 blue marbles, and 3 green marbles. Peter draws a marble randomly from the bag, replaces it, and then draws another marble randomly. What is the probability of drawing 2 blue marbles in a row? Explain your answer.

  • This Question is Closed
  1. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @Nnesha

  2. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    oky so i guess \[\rm \frac{ blue~marbles }{ total ~number~of marbles }\]

  3. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ahhh i'm not good 't probability stuff ?/>

  4. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    @jim_thompson5910

  5. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    ITS OK THANKS

  6. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    @Nnesha you're on the right track

  7. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    Would it be 2/8

  8. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    you need to figure out how many blue marbles there are, out of how many total probability of picking blue = (# of blue)/(# total) since replacements are made, this means that the probability does not change on the second draw

  9. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    probability of picking 2 blue = (probability of picking 1 blue)*(probability of picking 1 blue)

  10. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    so im kinda lost...so it would be 2= 1x1?

  11. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    we have 4 blue out of 8 total so you agree that the probability of picking one blue is 4/8 = 1/2 right?

  12. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes

  13. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    the probability of picking 2 blue is equal to P(2 blue) = P(1 blue AND 1 blue) P(2 blue) = P(1 blue)*P(1 blue) P(2 blue) = (1/2)*(1/2) P(2 blue) = (1*1)/(2*2) P(2 blue) = 1/4

  14. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    this rule only works because replacements are made and each drawing is independent

  15. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    OK so what should i write down? @jim_thompson5910

  16. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    Basically those steps and the answer. But in your own words and format that's unique to you. Hopefully you see how I got that answer?

  17. anonymous
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    yes thank u!

  18. jim_thompson5910
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 2

    you're welcome

  19. Nnesha
    • one year ago
    Best Response
    You've already chosen the best response.
    Medals 0

    thanks @jim_thompson5910 o^_^o

  20. Not the answer you are looking for?
    Search for more explanations.

    • Attachments:

Ask your own question

Sign Up
Find more explanations on OpenStudy
Privacy Policy

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.