(a) In a random sample of 186 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 186 children taken now, what is the probability that 50 or more have high blood-lead levels? (Round your answer to three decimal places.)

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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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 83% of children at risk. A concerted effort was made to
remove lead from the environment. Now, suppose only 12% of children in the United States are at risk of high blood-lead
levels.
USE SALT
(a) In a random sample of 186 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 186 children taken now, what is the probability that 50 or more have high blood-lead
levels? (Round your answer to three decimal places.)
Transcribed Image Text: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 83% of children at risk. A concerted effort was made to remove lead from the environment. Now, suppose only 12% of children in the United States are at risk of high blood-lead levels. USE SALT (a) In a random sample of 186 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 186 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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