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More than a decade ago, high levels of lead in the blood put 84% of children...

More than a decade ago, high levels of lead in the blood put 84% 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 220 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 220 children taken now, what is the probability that 50 or more have high blood-lead levels? (Round your answer to three decimal places.)

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