In the following problem, check that it is appropriate to use the normal approximation to the binomial. then use the normal distribution to estimate the requested probabilities. more than a decade ago, high levels of lead in the blood put 89% of children at risk. a concerted effort was made to remove lead from the environment. now, suppose only 13% of children in the united states are at risk of high blood-lead levels. (a) in a random sample of 202 children taken more than a decade ago, what is the probability that 50 or more had high blood-lead levels? (round your answer to three decimal places.) (b) in a random sample of 202 children taken now, what is the probability that 50 or more have high blood-lead levels? (round your answer to three decimal places.)