please help with these two!

Calculate the expected value, the variance, and the standard deviation of the given random variable X. (Round all Thirty-four darts are thrown at a dartboard. The probability of hitting a bull's-eye is 1. Let X be the numb expected value variance standard deviation Ald Calculate the standard deviation o of X for the probability distribution. (Round your a -20 -10 0 10 20 30 P(x = x) 0.1 0.2 0.1 0.1 0 0.5 NAL