Probability and Statistics Quiz

In random experiment, observations of random variable are classified as

• events

• composition

• trials

• functions

Sample space for experiment in which two coins are tossed is

• 4

• 8

• 2

• 10

A coin is tossed twice. What is the probability of getting two consecutive tails?

• 1/2

• 1/4

• 1/6

• 1/8

A complement of an event is denoted as P(Ac) or P(A’) =----

• 1 + P(A)

• P(A) -1

• 1 – P(A)

• none of these

If P(A) = 7 13 , P(B) = 9 13 and P(A ∩ B) = 4 13 , then P(A|B) =

• 3/9

• 4/9

• 2/9

• 1

Probability distribution of discrete random variable is classified as

• probability mass function

• posterior mass function

• interior mass function

• continuous mass function

A table with all possible value of a random variable and its corresponding probabilities is called ------ function

• probability mass

• probability density

• cumulative distribution

• probability distribution

The expected value of a discrete random variable ‘x’ is given by

• p(x)

• ∑ p(x)

• ∑ x p(x)

• 1

Probability distribution of a random variable is also known as -------------- function.

• probability

• probability cumulative

• probability distribution

• probability density

E(XY) = E(X).E(Y) if

• X and Y are independent variables

• X and Y are equal

• X and Y are dependent variables

• None of these