Question

The distribution of scores on a standardized aptitude test is approximately normal with a mean of 500 and a standard deviation of 95 What is the minimum score needed to be in the top 20%

on this test? Carry your intermediate computations to at least four decimal places, and round your answer to the nearest integer.

Answer #1

Given that, mean (μ) = 500 and standard deviation = 95

We want to find, the value of x such that, P(X > x) = 0.20

Therefore, the minimum score needed to be in the top 20% is
**580**

The distribution of math test scores on a standardized test
administered to Texas tenth-graders is approximately Normal with a
mean of 615 and a standard deviation of 46. Below what score do the
worst 2.5% of the scores fall? (Hint: apply the 68-95-99.7 Rule.)
Round your answer to the nearest integer.

Suppose that scores on a particular test are normally
distributed with a mean of 110 and a standard deviation of 19 .
What is the minimum score needed to be in the top 15% of the scores
on the test? Carry your intermediate computations to at least four
decimal places, and round your answer to one decimal place.

Scores on an aptitude test are approximately normal with a mean
of 100 and a standard deviation of 20. A particular test-taker
scored 125.6. What is the PERCENTILE rank of this test-taker's
score?
A. 50th percentile.
B. 10th percentile.
C. 90th percentile.
D. 95th percentile
E. None of the above.
The proportion of z-scores from a normal distribution that are
LARGER THAN z = -0.74 is
A. 0.23
B. 0.38
C. 0.80
D. 0.77
E. None of the above.
(c)...

Scores on an aptitude
test have been observed to be approximately normal with a mean of
76and a standard deviation of 5.
If 1000 people took
the test, how many would you expect to score above 80?

1.
Scores on an aptitude test form a normal distribution
with a mean of 140 and a standard deviaition of 12. Find the
percent that score between 131 and 155.
Group of answer choices
12.10%
22.66%
32.44%
66.78%
10.56%
2.
The scores of students on a standardized test form a
normal distribution with a mean of 140 and a standard deviaition of
12. If 36000 students took the test, how many scored above
149?
Group of answer choices
9634
7922...

Scores for a common standardized college aptitude test are
normally distributed with a mean of 499 and a standard deviation of
97. Randomly selected men are given a Test Prepartion Course before
taking this test. Assume, for sake of argument, that the test has
no effect. If 1 of the men is randomly selected, find the
probability that his score is at least 557.2. P(X > 557.2) =
Enter your answer as a number accurate to 4 decimal places. NOTE:...

Scores for a common standardized college aptitude test are
normally distributed with a mean of 483 and a standard deviation of
101. Randomly selected men are given a Test Prepartion Course
before taking this test. Assume, for sake of argument, that the
test has no effect.
If 1 of the men is randomly selected, find the probability that his
score is at least 550.8.
P(X > 550.8) =
Enter your answer as a number accurate to 4 decimal places. NOTE:...

Suppose the scores on an IQ test approximately follow a normal
distribution with mean 100 and standard deviation 12. Use the
68-95-99.7 Rule to determine approximately what percentage of the
population will score between 100 and 124.

The scores on an examination in finance are approximately
normally distributed with mean 500 and an unknown standard
deviation. The following is a random sample of scores from this
examination.
447, 458, 492, 519, 571, 593, 617
Find a 95% confidence interval for the population standard
deviation. Then complete the table below. Carry your intermediate
computations to at least three decimal places. Round your answers
to at least two decimal places.

Scores for a common standardized college aptitude test are
normally distributed with a mean of 492 and a standard deviation of
100. Randomly selected men are given a Test Prepartion Course
before taking this test. Assume, for sake of argument, that the
test has no effect.
If 1 of the men is randomly selected, find the probability that
his score is at least 533.3. P(X > 533.3) = ?
Enter your answer as a number accurate to 4 decimal places....

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