Ask a Question

Three balls are drawn simultaneously from a bag containing 5 white and 4 red balls. Let X be the number of red balls drawn. Find the mean and variance

in Education by
Three balls are drawn simultaneously from a bag containing 5 white and 4 red balls. Let X be the number of red balls drawn. Find the mean and variance of X. Select the correct answer from above options

1 Answer

0 votes
by
 
Best answer
Correct Answer - `"Mean "=(4)/(3), "variance "=(5)/(9)` `P(X=0)=(""^(5)C_(3))/(""^(9)C_(3))=(5)/(42),P(X=1)=((""^(4)C_(1)xx""^(5)C_(2)))/(""^(9)C_(3))=(10)/(21)` `P(X=2)=((""^(4)C_(2)xx""^(5)C_(1)))/(""^(9)C_(3))=(5)/(14), P(X=3)=(""^(4)C_(3))/(""^(9)C_(3))=(1)/(21).`

Related questions

0 votes
Q: A bag contains 3 White, 3 black and 2 red balls. One by one three balls are drawn without replacement. Find the probability that third ballis red
    A bag contains 3 White, 3 black and 2 red balls. One by one three balls are drawn without replacement. Find ... that third ballis red Select the correct answer from above options...
asked Nov 13, 2021 in Education by JackTerrance
0 votes
Q: Bag I contains 3 red and 4 black balls while another Bag II contains 5 red and 6 black balls. One ball is drawn at random from one of the bags and it
    Bag I contains 3 red and 4 black balls while another Bag II contains 5 red and 6 black balls. One ball is ... was drawn from Bag II. Select the correct answer from above options...
asked Nov 13, 2021 in Education by JackTerrance
0 votes
Q: Threre are 9 red,7 white and 4 black balls in an urn. Two balls are drawn at random from the urn. What will be the probability that both the balls are
    Threre are 9 red,7 white and 4 black balls in an urn. Two balls are drawn at random from the urn. What will be the ... C. 9 10 D. 8 95 Select the correct answer from above options...
asked Nov 13, 2021 in Education by JackTerrance

© Copyright 2018-2023 www.Blogmepost.com. All rights reserved. Developed by Blogmepost.

...