A community for students.

Here's the question you clicked on:

55 members online
  • 0 replying
  • 0 viewing

anonymous

  • one year ago

A box of 15 parts contains 7 that are defective. A worker picks parts one at a time and attempts to install them. Find the probability of each outcome in​ (a) through​ (d). ​(a) The first two chosen are both good. nothing ​(Round to four decimal places as​ needed.)

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

    Please check your question, which probably contains typo(s) and incomplete. Cannot have 15 parts of which 77 are defective.

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

    it a 7

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

    P(two are good) \[=\frac{C _{2}^{8} }{C_{2}^{15} }\]=?

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

    30

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

    ok im so lost 8/15

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

    and 054

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

    pl help me out

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

    im so lost and dum

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

    (a) Initially, there are 8 good out of 15, so probability of getting the first good one is 8/15. For the next one, there are only 7 good out of 14, so probability is 7/14. For this two step experiment, the probability of getting 2 good out of two is therefore (8/15)*(7/14)=4/15. Alternatively, you could use the formula by @Surjithayer

  10. 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.