Question

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 87% of
children at risk. A concerted effort was made to remove lead from
the environment. Now, suppose only 15% of children in the United
States are at risk of high blood-lead levels.

(a) In a random sample of 212 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 212 children taken now, what is the
probability that 50 or more have high blood-lead levels? (Round
your answer to three decimal places.)

Answer #1

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 84% of
children at risk. A concerted effort was made to remove lead from
the environment. Now, suppose only 8% of children in the United
States are at risk of high blood-lead levels.
(a) In a random sample of 212...

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 13% of children in the United States
are at risk of high blood-lead levels.
(a) In a random sample of 216...

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 90% of children at
risk. A concerted effort was made to remove lead from the
environment. Now, suppose only 14% of children in the United States
are at risk of high blood-lead levels. (a) In a random sample of
210...

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 88% of
children at risk. A concerted effort was made to remove lead from
the environment. Now, suppose only 10% of children in the United
States are at risk of high blood-lead levels.
(a) In a random sample of 188...

More than a decade ago, high levels of lead in the blood put 87%
of children at risk. A concerted effort was made to remove lead
from the environment. Now, suppose only 17% of children in the
United States are at risk of high blood-lead levels.
(a) In a random sample of 188 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)...

1.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 86% of
children at risk. A concerted effort was made to remove lead from
the environment. Now, suppose only 8% of children in the United
States are at risk of high blood-lead levels.
(a) In a random sample of 216...

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 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.
Ocean fishing for billfish is very popular in the Cozumel region of
Mexico. In the Cozumel region about 41% of strikes (while trolling)
resulted in a catch. Suppose that on a given day a fleet of fishing
boats got a total of 26 strikes. Find the following probabilities.
(Round your answers to four...

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.
It is estimated that 3.6% of the general population will live past
their 90th birthday. In a graduating class of 731 high school
seniors, find the following probabilities. (Round your answers to
four decimal places.)
(a) 15 or more will live beyond their 90th birthday
(b) 30 or more will live beyond their...

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. What's your
favorite ice cream flavor? For people who buy ice cream, the
all-time favorite is still vanilla. About 27% of ice cream sales
are vanilla. Chocolate accounts for only 7% of ice cream sales.
Suppose that 184 customers go to a grocery store in Cheyenne,
Wyoming, today to buy ice cream. (Round...

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