I cannot figure this out. When I do it get the wrong answer

Consider the probability distribution shown below. x 0,1,2 P ( x)

Consider the probability distribution shown below.x0,1,2P(x)0.450.200.35

x: 0 1 2

P(x): 0.35 0.20 0.45

Compute the expected value of the distribution. (Enter a number.)

My answer is 0.9 but marked wrong.

Compute the standard deviation of the distribution. (Enter a number. Round your answer to four decimal places.) My answer is 0.8367 also marked wrong.