random variable and probability distribution

Let 'X' be a discrete random variable. The probability distribution of X is given below : Then E(X) is equal to :

Let 'X' be a discrete random variable. The probability distribution of X is given below : Then E(X) is equal to:

If X is a random variable with probability distribution as given below: X=x_i : 0 1 2 3 P(X=x_i): k 3k 3k k The value of k and its variance are (A) 1/8, 22/27 (B) 1/8, 23/27 (C) 1/8, 24/27 (D) 1/8,3/4

Find the variance and standard deviation of the random variable X whose probability distribution is given below : {:(x,0,1,2,3),(P(X=x),1/8,3/8,3/8,1/8):}

A random variable X has the probability distribution given below Its variance is

A random variable 'X' has a probability distribution P(X) of the following form (k is constant): then k = __________ .

Which of the following distributions of probability of random variable X are the probability distributions? X:0123P(X):0.30.20.40.1