what is the standard deviation for the distribution b

Given the probability distributions shown to the right, complete the following parts. a. Compute the expected value for each distribution. b. Compute the standard deviation for each distribution. c. What is the probability that x will be at least 3 in Distribution A and Distribution B? d. Compare the results of distributions A and B. a. What is the expected value for distribution A'? =0.99 (Type an integer or decimal rounded to three decimal places as needed.) What is the expected value for distribution B ? = (Type an integer or decimal rounded to three decimal places as needed.) b. What is the standard deviation for distribution A? =1.170 (Type an integer or decimal rounded to three decimal places as needed.) What is the standard deviation for distribution B? = (Type an integer or decimal rounded to three decimal places as needed.)