Thread: Mean, Variance, and Standard Deviation

x ------ 1 ------- 2 -------3-------- 4------ 5
P(X=x) .18----- .22 -------.35------ a ------.13

need some help in solving this
not the answer jus the steps

i solved a already
a=.12

find the value of a
find the mean of the random variable X
find the value of the E(X^2)
find the variance the the random variable X
find the standard deviation of the random variable X

Originally Posted by math321

x ------ 1 ------- 2 -------3-------- 4------ 5
P(X=x) .18----- .22 -------.35------ a ------.13
i solved a already
a=.12

find the mean of the random variable X
find the value of the E(X^2)

Mean is

Likewise,