A certain drug treatment cures 90% of cases of hookworm in children. Suppose that 20 randomly selected children suffering from hookworm are to be treated, and that the children can be regarded as a random sample from the population. Find the probability that (a) all 20 will be cured. (b) no more than 2 will be cured (c) more than 78% will be cured. (d) no more than 95% will be cured (e) What is the mean and standard deviation of the number of cured out of 20