Solved: What is the mean and standard deviation of the number of, Applied Statistics

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What is the mean and standard deviation of the number of

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?

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