Help please

Problem 3: In a recent survey, 80% of the community favored building a police substation in their neigh- borhood. a. If 15 citizens are chosen, what is the mean number and the standard deviation of the number favoring building a police substation? b. If 15 citizens are chosen, what is the probability that 10 of them are favoring the substation? c. If 15 citizens are chosen, what is the probability that at least 12 of them are favoring building a police substation? Problem 4: The probability that an individual is left-handed is 0.26. a. In a class of 10 students, what is the mean and standard deviation of the number of left-handers in the class? b. In a class of 10 students, what is the probability that less than 2 students are left-handers in the class? c. In a class of 10 students, what is the probability that more than 5 students are left-handers in the class