number 11-15 multiple choice please

Question 11 (1 point) Consider the following probabilities X -4 -3 -2 -1 0 1 2 3 4 p(x) .02.07.10.15.30 -- .10.06.02 What is p(x s 1)? O a) .88 O b) . 82 O c) . 92 O d) . 84 O e) . 64Question 12 (1 point) Let x be a binomial random variable and suppose n= 20, p=0.4. Then Put-30 s x s p.+30r) is: O a) 0.980 O b) 0.987 O c) 1.000 C) d) 0.985 C) e) 0.999 Question 13 (1 point) Suppose x is a binomial random variable with n = 7 and p=0.8. What is P(x > 1)? O a) 0.919 C) b) 0.687 O c) 1.00 C) d) 0.988 C) e) 0.083 \fQuestion 15 (1 point) Saved Let x be a binomial random variable and suppose n= 20, p=0.8. Then the standard deviation is: G) a) 1.79 O b) 2.30 O c) 2.19 C) d) 2.24 C) e) 2.28