Question

Scores on an English test are normally distributed with a mean
of 30.6 and a standard deviation of 6. b) Find the score that is at the 80 |

Answer #1

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Scores on a certain test are normally distributed with a mean of
77.5 and a standard deviation 9.3.
a) What is the probability that an individual student will score
more than 90?
b) What proportion of the population will have a score between
of 70 and 85?
c) Find the score that is the 80th percentile of all tests.

Scores on an English test are normally distributed with a mean
of 37.6 and a standard deviation of 7.6. Find the score that
separates the top 59% from the bottom 41%

Scores on an English test are normally distributed with a mean
of 37.6 and a standard deviation of 7.6. Find the score that
separates the top 59% from the bottom 41% Group of answer choices
35.9 39.3 42.1 33.1

In a recent year, the ACT scores for the English portion of the
test were normally distributed, with a mean of 20 and a standard
deviation of six. A high school student who took the English
portion of the ACT is randomly selected
a) Find the probability that the student’s ACT score is less
than15?
b) Find the probability that the student’s ACT score is between
18 and25?
c) Find the probability that the student’s ACT score is more
than34?...

Scores by women on the SAT-1 test are normally distributed
with a mean of 988 and a standard deviation of 202. Scores by women
on the ACT test are normally distributed with a mean of 20.9 and a
standard deviation of 4.6.
If a women gets a SAT score that is the 77th percentile, find
her actual SAT score and her equivalent ACT score.

7. IQ scores are normally distributed with a mean of 100 and a
standard deviation of 15 points.
a. Find the probability that a randomly selected person has an
IQ less than 115.
b. Find the probability that a randomly selected person has an
IQ above 60.
c. Find the 80th percentile for IQ scores.
d. Find the probability that 20 randomly selected person has an
IQ less than 110.
e. What percentage of people have IQ scores between 60...

IQ test scores are normally distributed with a mean of 100 and a
standard deviation of 15.
a) Find the IQ scores that represent the bottom 35%
. b) Find the IQ score that represents the 3rd Quartile
c) Find the IQ score for the top 5%

A math professor notices that scores from a recent test are
normally distributed with a mean of 70 and a standard deviation of
4.
(a) What score do 75% of the students test scores fall
below?
Answer:
(b) Suppose the professor decides to grade on a curve. If the
professor wants 2.5% of the students to get an A, what is the
minimum score for an A?
Answer:

The scores on a certain test are normally distributed with a
mean score of 70 and a standard deviation of 3. What is the
probability that a sample of 90 students will have a mean score of
at least 70.3162?

scores on a college entrance test are normally
distributed with a mean 300 and a standard deviation of 50
if a test score is picked at random what is the probability that
the score is less than 215 or more than 345
b) find two test scores that divide the normal curve
into a middle of 0.92 and two 0.04 areas

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