Question
In: Statistics and Probability
The distribution of results from a cholesterol test has a mean of 180 and a standard...
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The distribution of results from a cholesterol test has a mean of 180 and a standard deviation of 20. A sample size of 40 is drawn randomly. a. Find the probability that the sum of the 40 values is greater than 7,500. b.
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Solutions
orchestra answered 2 years agoRelated Solutions
The distribution of results from a cholesterol test has a mean of 180 and a standard...
The distribution of results from a cholesterol test has a mean
of 180 and a standard deviation of 20. A sample size of 40 is drawn
randomly.
Find the probability that the sum of the 40 values is greater
than 7,450. (Round your answer to four decimal places.)
3. The distribution of results from a cholesterol test has a mean of 180 and a...
3. The distribution of results from a
cholesterol test has a mean of 180 and a standard deviation of 20.
A sample size of 40 is drawn randomly.
a. Find the probability that the sum of the 40
values is greater than 7,550. (Round your answer to four decimal
places.
b. Find the sum that is 1.6 standard deviations
below the mean of the sums. (Round your answer to two decimal
places.)
4. A researcher measures the amount of sugar...
The distribution of results from a cholesterol test has a mean of 180 and a standard deviation of 20. A sample size of 40 is drawn randomly.
The distribution of results from a cholesterol test has a
mean of 180 and a standard deviation of 20. A sample size of 40 is
drawn randomly.Find the sum that is one standard deviation below the mean of the
sums. (Round your answer to two decimal places.)
12. A standard IQ test has a normal distribution with a mean of 100 with a...
12. A standard IQ test has a normal distribution with a mean of
100 with a standard deviation of 15.
a) A score of 145 or higher on this exam is categorized in the
gifted realm. What percent of people would be considered gifted?
___________
b) The people who score in the lowest 5% of the standard IQ test
are considered to have “mental retardation”. What cutoff score is
used to qualify for this benchmark? ___________
A population has a mean of 180 and a standard deviation of 36. A sample of...
A population has a mean of 180 and a standard deviation of 36. A
sample of 84 observations will be taken. The probability that the
sample mean will be between 181 and 185 is
A population has a mean of 180 and a standard deviation of 24. A sample of...
A population has a mean of 180 and a standard deviation of 24. A
sample of 64 observations will be taken. The probability that the
sample mean will be between 183 and 186 is
A population has a mean of 180 and a standard deviation of 24. A sample of...
A population has a mean of 180 and a standard deviation of 24. A
sample of 64 observations will be taken. The probability that the
sample mean will be within 3 of the population mean is:
A population has a mean of 180 and a standard deviation of 24. A sample of...
A population has a mean of 180 and a standard deviation of 24. A
sample of 64 observations will be taken. The probability that the
sample mean will be less than or equal to 186 is
The distribution of certain test scores is a nonstandard normal distribution with a mean of 50 and a standard deviation of 6
The distribution of certain test scores is a nonstandard normal distribution with a mean of 50 and a standard deviation of 6. What are the values of the mean and standard deviation after all test scores have been standardized by converting them to z-scores using z = (x - µ) / σ ?Select one:a. The mean is 1 and the standard deviation is 0.b. The mean is 0 and the standard deviation is 1.c. The mean is 100 and the...
Scores of an IQ test have a bell-shaped distribution with a mean of 100 and a standard...
Scores of an IQ test have a bell-shaped
distribution with a mean of 100 and a standard deviation of 20.
Use the empirical rule to determine the following:
(a) What percentage of people has an IQ score
between
60 and 140?
(b) What percentage of people has an IQ score less
than
60 or greater than 140?
(c) What percentage of people has an IQ score greater
than 160?
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