Barbara decided to sell her house. A random variable X models the number of passengers in cars arriving at the auction for Jane’s house.
X takes values of 0 or 1 or 2 or 3. The probabilities it takes the values 1, 2, or 3 are 0.3, 0.2, and 0.1 respectively.
(a) Find the mean value of X.
(b) Find the standard deviation of X. 

Answer rating: 100% (QA)

AB Px 0 x 40 1 2 PX 1 03 03 P X 22 a The mean value EX X Px x 20 3 1 1 ... View the full answer