Find the mean and standard deviation of x for each of the following binomial random variables:
a. The number of tails seen in 50 tosses of a quarter
b. The number of left-handed students in a classroom of 40 students (Assume that 11% of the population is left-handed.)
c. The number of cars found to have unsafe tires among the 400 cars stopped at a roadblock for inspection (Assume that 6% of all cars have one or more unsafe tires.)
d. The number of melon seeds that germinate when a package of 50 seeds is planted (The package states that the probability of germination is 0.88.)