Question

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) The proportion of z-scores from a normal distribution that
are LESS THAN z = 1.17 is

**A.** 0.24

**B.** 0.88

**C.** 0.12

**D.** 0.85

**E.** None of the above.

Answer #1

A normal distribution of MA-321 test scores has a mean of 81.7
and a standard deviation of 5.8 Answer the following: a) What
percentage of the test scores are below 90? b) What percentage of
the test scores are above 75? c) What percentage of students have
test scores between 80 and 93? d) What test score is at the 95th
percentile?

It has been found that scores on the Writing portion of the SAT
(Scholastic Aptitude Test) exam are normally distributed with mean
484 and standard deviation 115. Use the normal distribution to
answer the following questions.
(a) What is the estimated percentile for a student who scores
475 on Writing?
(b) What is the approximate score for a student who is at the
90th percentile for Writing?

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.

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 on an aptitude test are distributed with a mean of 220
and a standard deviation of 30. The shape of the distribution is
unspecified. What is the probability that the sampling error made
in estimating the population mean by the mean of a random sample of
50 test scores will be at most 5 points? Round to three decimal
places.

4)The distribution of scores on a recent test closely followed a
Normal Distribution with a mean of 22 points and a standard
deviation of 2 points.
(a) What proportion of the students scored at least 21 points on
this test, rounded to five decimal places?
(b) What is the 31 percentile of the distribution of test
scores, rounded to three decimal places?

The distribution of scores on a recent test closely followed a
Normal Distribution with a mean of 22 points and a standard
deviation of 2 points. For this question, DO NOT apply the
standard deviation rule.
(a) What proportion of the students scored at least 25 points on
this test, rounded to five decimal places?
(b) What is the 29 percentile of the distribution of test
scores, rounded to three decimal places?

The distribution of scores on a recent test closely followed a
Normal Distribution with a mean of 22 points and a standard
deviation of 2 points. For this question, DO NOT apply the standard
deviation rule. (a) What proportion of the students scored at least
19 points on this test, rounded to five decimal places? (b) What is
the 42 percentile of the distribution of test scores, rounded to
three decimal places?

The distribution of scores on a recent test closely followed a
Normal Distribution with a mean of 22 points and a standard
deviation of 2 points. For this question, DO NOT apply the standard
deviation rule. (a) What proportion of the students scored at least
26 points on this test, rounded to five decimal places? (b) What is
the 42 percentile of the distribution of test scores, rounded to
three decimal places?

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