Recent questions and answers in Probability

If the variance of the random variable X is 9, the standard deviation of the random variable -4x+8 is?

answered Apr 6, 2019 by yachyuth2001

1 answer

Two fair dice are tossed once. The probability of getting an even number on the first die or a total of 8 is

answered Mar 18, 2018 by prakashtiwariaditya

2 answers

Seven white balls and three black balls are randomly placed in a row. The probability that no two black balls are placed adjacently equals

answered Jul 9, 2017 by phaniajit2005

2 answers

6 boys and 6 girls sit randomly in a row, what is thae probability that boys and girls sit alternately?

answered Feb 15, 2014 by rvidyagovindarajan_1

1 answer

Lets say you enter a Chess tournament. The probability of winning a game against half the players is 0.3, the probability of winning against one quarter of them is 0.4 and the probability of winning against the remaining one quarter is 0.5. Let's say you play against a randomly chosen opponent. What is your probability of winning?

answered Feb 12, 2014 by balaji.thirumalai

1 answer

If you flip a fair coin 19 times, what is the probability that you will end up with an even number of heads?

answered Jan 29, 2014 by balaji

1 answer

In a binomial distribution the mean is 15 and variance is 10, then parameter $n$ is

answered Jan 16, 2014 by thanvigandhi_1

1 answer

Probability of getting positive integral roots of the equation $ x^2-n=0$ for the integer $ n \: \: \: 1 \leq n \leq 40$ is

answered Jan 16, 2014 by thanvigandhi_1

1 answer

Twelve tickets are numbered from 1 to 12. One tickets is drawn at random, then the probability of the number to be divisible by 2 or 3 is

answered Jan 16, 2014 by thanvigandhi_1

1 answer

If X is a Poisson variate such that $ P(X=1)=P(x=2)$ the $P(x=4)$ is equal to

answered Jan 16, 2014 by thanvigandhi_1

1 answer

A fair die is tossed eight times. The probability that a third six is observed on the eight throw is

answered Jan 16, 2014 by thanvigandhi_1

1 answer

The mean and standard deviation of a binomial variate X are 4 and $ \sqrt 3$ respectively. The $P( X \geq 1 )$ is equal to

answered Jan 16, 2014 by thanvigandhi_1

1 answer

If X is a binomial variate with the range { 0,1,2,3,4,5,6 } and P(X = 2)=4P (x=4) then the parameter P of X is

answered Jan 16, 2014 by thanvigandhi_1

1 answer

If $P(A)=P(B)=x\: and \: P(A \cap B ) = P(A' \cap B')=\large\frac{1}{3}$ then x is equal to

answered Jan 16, 2014 by thanvigandhi_1

1 answer

If $P(A)=\large\frac{1}{12}\: P(B)=\large\frac{5}{12}\: and \: P(B/A) = \large\frac{1}{15}$ then $P(A \cup B )$ is equal to

answered Jan 16, 2014 by thanvigandhi_1

1 answer

A random variable X follows binomial distribution with mean $ \alpha$ and variance $ \beta$ Then

answered Jan 16, 2014 by thanvigandhi_1

1 answer

The chances to fail in Physics are 20% and the chances to fail in Mathematics are 10%. What are the chances to fail in at least one subject ?

answered Jan 16, 2014 by thanvigandhi_1

1 answer

A bag contains 3 black, 3 white and 2 red balls. One by one three balls are drawn without replacement. The probability that the third ball is red is equal to

answered Jan 16, 2014 by thanvigandhi_1

1 answer