Question
In: Statistics and Probability
Suppose the scores earned on a statistics test are normally distributed with a mean of 65...
Suppose the scores earned on a statistics test are normally distributed with a mean of 65 and a standard deviation 8. The instructor wants to curve the test scores as follows: The top 5% get an A, the next 20% get a B, the middle 50% get a C, the bottom 10% get an F, and the rest earn a D. Determine the score cutoffs for the test.
Solutions
orchestra answered 2 years agoRelated Solutions
Suppose that scores on a test are normally distributed with a mean of 80 and a...
Suppose that scores on a test are normally distributed with a
mean of 80 and a standard deviation
of 8. Which of the following questions below are of type B?
a. Find the 80th percentile.
b. Find the cutoff for the A grade if the top 10% get an A.
c. Find the percentage scoring more than 90.
d. Find the score that separates the bottom 30% from the top
70%.
e. Find the probability that a randomly selected student...
Suppose that scores on a test are normally distributed with a mean of 80 and a...
Suppose that scores on a test are normally distributed with a
mean of 80 and a standard deviation of 8. Determine the score that
would be considered the first/lower quartile (??)
Suppose that student scores on creativity test are normally distributed. The mean of the test is...
Suppose that student scores on creativity test are normally
distributed. The mean of the test is 150 and the standard deviation
is 23. Using a z-table (normal curve table), what percentage of
students have z-scores a) below 1.63 b) above -0.41 Using a
z-table, what scores would be the top and bottom raw score to find
the c) middle 50% of students d) middle 10% of students Using a
z-table, what is the minimum raw score a student can have...
1) Suppose the scores of students on a Statistics course are Normally distributed with a mean...
1) Suppose the scores of students on a Statistics course are
Normally distributed with a mean of 542 and a standard deviation of
98. What percentage of the students scored between 542 and 738 on
the exam? (Give your answer to 3 significant figures.)
2) A new car that is a gas- and electric-powered hybrid has
recently hit the market. The distance travelled on 1 gallon of fuel
is normally distributed with a mean of 65 miles and a standard...
Suppose that scores on a particular test are normally distributed with a mean of 140 and...
Suppose that scores on a particular test are normally
distributed with a mean of 140 and a standard deviation of 16. What
is the minimum score needed to be in the top 20% of the scores on
the test? Carry your intermediate computations to at least four
decimal places, and round your answer to one decimal place.
Suppose that the scores on a statewide standardized test are normally distributed with a mean of...
Suppose that the scores on a statewide standardized test are
normally distributed with a mean of 75 and a standard deviation of
2. Estimate the percentage of scores that were (a) between 73 and
77. % (b) above 79. % (c) below 73. % (d) between 69 and 79. %
Suppose that student scores on math skills test are normally distributed. The mean of the test...
Suppose that student scores on math skills test are normally
distributed. The mean of the test is 35 and the standard deviation
is 4. Using a z-table (normal curve table), what percentage of
students have z-scores a) below 2.05 b) above -0.50 Using a
z-table, what scores would be the top and bottom score to find the
c) middle 15% of students d) middle 25% of students Using a
z-table, what is the minimum raw score a student can have...
. Suppose the scores on a chemistry test were normally distributed with a mean of 78...
. Suppose the scores on a chemistry test were normally
distributed with a mean of 78 and a standard deviation of 10. If a
student who completed the test is chosen at random,
Find the probability that the student earned fewer than 75
points.
Find the probability that the student earned at least 70
points.
Find the probability that the student earned between 80 and 90
points.
Find the probability that the student earned either less than
80 points or...
Suppose that scores on a contract negotiation skills test are normally distributed. The mean of the...
Suppose that scores on a contract negotiation skills test are
normally distributed. The mean of the test is 75 and the standard
deviation is 9.
Using a z-table (normal curve table), what percentage of
negotiators have z-scores
a) above -3.00
b) above 2.33
Using a z-table, what scores would be the top and bottom score
to find the
c) middle 55% of negotiators
d) middle 9% of negotiators
Using a z-table, what is the minimum raw score a negotiator can...
Suppose the test scores for a college entrance exam are normally distributed with a mean of...
Suppose the test scores for a college entrance exam are normally
distributed with a mean of 450 and a s. d. of 100.
a. What is the probability that a student scores between 350 and
550?
b. If the upper 3% scholarship, what score must a student
receive to get a scholarship?
c. Find the 60th percentile of the test scores.
d. Find the middle 30% of the test scores.
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