The random variable X has the following probability distribution x 0 1 2 P(x) 0.2 0.6 0.2 The variance of this distribution is   1 - 1.4 2 - 0.4 3 - 1.0 4 - 0.1

The discrete random variable X has the following probability distribution: -10 0 10 p(x) 0.20 0.40 .10 Which one of the following correctly gives the value of the mean and standard deviation of X? OH = 0.5, o = 37.5 OH = 2.25, o = 37.25 OH = 0.5, o = 6.10 OH= 2.25, o = 6.10 OH= 0.5 o = 37.25

The table below shows the probability distribution for a discrete random variable X. X 0 1 2 4 5 P(X=x)     0.15  0.20 n 0.30 0.10 a. State the value of n. b. Calculate the expected value, E(x).  c. Calculate the variance, Var(x).

6. A discrete random variable can assume 5 possible values, as listed in the accompanying probability distribution. X: p(x): 0.5 (b) Find the variance of X 2.53 2.16 0 1 0.16 0.53 0.8659 2 0.20 3 0.08 4 0.03