An accidents study shows that a month may be considered as a high, medium, or low accidents month with probabilities 0.1, 0.3, and 0.7, respectively. The numbers of accidents follow Poisson distributions with means 20, 15, and 10, respectively. The variance of the number of accidents is: Select one: O a. 11.75 O b. 23.75 O C. 36.75 O d. 8 O e. 8.75