Post a New Question

Algebra2 {ASAP}

posted by .

Hi helper, I used permutation for the following question. How can i use combination to find the answer? Help me please!

There are 12 red checkers and 3 black checkers in a bag. Checkers are selected one at a time, with replacement. Each time, the color of the checker is recorded. Find the probability of selecting a red checker exactly 7 times in 10 selections. Show your work.
Answer:
P(success)=P(red)= 12/15= 0.8
n=7 r=5
10C7= 10!/(10-7)! = 10!/3! = 10*9*8*7*6*5*4*3!/ 3!= 10*9*8*7*6*5*4= 604,800
P(red7times)= 10C7 (0.8)^7(0.2)^3
= 604,800 (0.8)^7(0.2)^3
= 604,800 (0.2)(.008)
= 604,800(0.0016)
=967.68

  • Algebra2 {ASAP} -

    How can the probability be greater than one?

    The probability of both/all events occurring is determined by multiplying the probabilities of the individual events.

    (12/15)^7 * (3/15)^3 = ?

Respond to this Question

First Name
School Subject
Your Answer

Similar Questions

  1. math

    in each game there are 12 red checkers and 12 black checkers.If tom put all the checkers in the bag and randomly picked 2,what is the probability that both will be black?
  2. math

    a bag contains 12 black checkers and 12 red checkers. What is the probability of choosing two red checkers?
  3. Algebra

    3. There are 12 red checkers and 3 black checkers in a bag. Checkers are selected one at a time, with replacement. Each time, the color of the checker is recorded. Find the probability of selecting a red checker exactly 7 times in …
  4. Math

    If I picked a red checker from a bag of 9 black checkers and 6 red checkers, replacing it, and picking a red checker. What would the probability be of each set?
  5. Algebra II

    Help me with this question please There are 12 red checkers and 3 black checkers in a bag. Checkers are selected one at a time, with replacement. Each time, the color of the checker is recorded. Find the probability of selecting a …
  6. Algebra II

    help please There are 12 red checkers and 3 black checkers in a bag. Checkers are selected one at a time, with replacement. Each time, the color of the checker is recorded. Find the probability of selecting a red checker exactly 7 …
  7. Algebra ll

    Help me with this please There are 12 red checkers and 3 black checkers in a bag. Checkers are selected one at a time, with replacement. Each time, the color of the checker is recorded. Find the probability of selecting a red checker …
  8. Algebra 2

    1. A bag contains 12 red checkers and 6 black checkers. You will randomly select two checkers, one at a time, without replacement. (a) In how many ways can you select two checkers so that at least one of the checkers is red?
  9. Algebra 2

    1. A bag contains 12 red checkers and 6 black checkers. You will randomly select two checkers, one at a time, without replacement. (a) In how many ways can you select two checkers so that at least one of the checkers is red?
  10. algebra

    There are 12 red checkers and three black checkers in a bag. Checkers are selected one at a time, with replacement. each time the color of the checker is recorded, find the probability of selecting a red checker exactly seven times …

More Similar Questions

Post a New Question