Variance of a discrete random variable

Mean of a discrete random variable

The probability distribution of a discrete random variable x is given as under Calculate (i) the value of A, if E(X)=2.94. (ii) variance of X.

The probability distribution of a discrete random variable X is given below The value of k is

The probability distrubtion of a discrete random variable X is as below : Find (P X le 4)

The probability distribution of a discrete random variable X is given as under: X :1242A3A5A P(X):1/21/53/(25)1/(10)1/(25)1/(25) Calculate: The value of A ,ifE(X)=2. 94 (ii) Variance ofXdot

If the probability mass function of a discrete random variable X is P(x)=C/(x^3), x=1,2,3 =0, otherwise Then E(X)=

The pdf of a discrete random variable is defined as f(x)={{:(kx^2","0lexle6),(0", ""elsewhere"):} Then the value of F(4) is

The probability distribution of discrete random variable X is given below {:(x,2,3,4,5),(P(x),5/K,7/k,9/k,11/k):} find the value of K.

Two probability distributionof the discrete random variable X and Y are given below. Prove that E(Y^(2))=2E(X) .