Withdrawal symptoms may occur when a person usang a painkiler suddenly stops using it. For a special type of painkiller, withdrawal symptoms occur in 5% of the cases. Consider a random sample of 1900 people who have stopped using the painkilier. Answer the following. (If necessary, consult a list.of formulas.) (a) Find the mean of p, where p is the proportion of people in the sample who expenence withdrawal symptoms. (h) Find the standard deviation of p. (c) Compute an approximation for P(p