More than a decade ago, high levels of lead in the blood put 81% 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. (a) In a random sample of 208 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 208 children taken now, what is the probability that 50 or more have high blood-lead levels? (Round your answer to three decimal places.)
Contingency Table
A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.
Binomial Distribution
Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.
More than a decade ago, high levels of lead in the blood put 81% 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.
(a) In a random sample of 208 children taken more than a decade ago, what is the
(b) In a random sample of 208 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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