Q. 1 D4.4( 7 Votes )

# State which of the following are not the probability distributions of a random variable. Give reasons for your answer.

Answer :

Given: A given table with values for X and P(X).

As we know the sum of all the probabilities in a probability distribution of a random variable must be one.

Hence the sum of probabilities of given table = 0.3 + 0.2 + 0.4 + 0.1 + 0.05

= 1.05 ≠ 1

Hence, the given table is not the probability distributions of a random variable.

Rate this question :

An urn contains 3 white and 6 red balls. Four balls are drawn one by one with replacement from the urn. Find the probability distribution of the number of red balls drawn. Also, find mean and variance of the distribution.

Mathematics - Board PapersTwo cards are drawn simultaneously (without replacement) from a well-shuffled pack of 52 cards. Find the mean and variance of the number of red cards.

Mathematics - Board PapersLet and * be a binary operation on A defined by

Show that * is commutative and associative. Find the identity element for * on A. also find the inverse of every element

Mathematics - Board PapersWhich of the following distributions of probabilities of a random variable X are the probability distributions?

RD Sharma - Volume 2

Which of the following distributions of probabilities of a random variable X are the probability distributions?

RD Sharma - Volume 2

A random variable X has the following probability distribution:

RD Sharma - Volume 2