If on an average, two customer arrive at shopping mall per minute, what is the probability that in a given minute, exactly 3 customers will arrive?

Suppose A an nxn matrix has all real values and it is also skew symmetric

(A^T = - A) then which of the following is/are true?

I. if n is odd then det(A) = 0

II. A is always diagonalizable

III. if n is even then det(A) = 0

The probability of rejecting the null hypothesis when it is true is called the level of confidence.

A failing student is passed by an examiner. This is an example of Type 2 error

Four dice are rolled. The number of possible outcomes in which at least one dice show 2 is

For a discrete random variable X with a finite range, knowing E(X) suffices to figure out the probability distribution of X.

Find the expectation of a random variable X?