The following table is a probability distribution for the random variable x. X P(x) 6.0 25% 12.0 50% 18.0 25% What is the expected value of x, E(x), and the standard deviation of x, o? O E(x)=12.00 and o=4.24 O E(x)=12.00 and o=18.00 O E(x)=4.24 and o=12.00 O E(x)=6.00 and o=4.49 O E(x)=3.00 and o=4.24