help please

0 7 6 9 O O 0.25 025 0.2 0.15 P() P() 0.15 0.05 0.05 O 7 8 1 2 3 4 7 8 9 0 1 4 O O (b) Compute the expected number of vehicles out of 9 that will tailgate. vehicles (c) Compute the standard deviation of this distribution. (Round your answer to two decimal places.) vehicles