Question
In: Statistics and Probability
Suppose that the midterm score of a class is normally distributed with the mean of 68.2...
Suppose that the midterm score of a class is normally distributed with the mean of 68.2 points and the standard deviation of 11.3 points. Answer each question.
-
(5 pts) Sketch the curve of the distribution representing the midterm score. Make sure to mark the mean and three standard deviations to either side of the mean.
-
(10 pts) Find the probability that a randomly selected student has score at most 65.9
-
(10 pts) To be in the top 20% of the class, you need to score what point?
d. (10 pts) What is the probability that the average score of 13 students is more than 87 points? explain details please if calculator is used
Solutions
orchestra answered 2 years agoRelated Solutions
on an english exam test are normally distributed with a mean of 68.2 and standard diviation...
on
an english exam test are normally distributed with a mean of 68.2
and standard diviation of 11.7. find the score that seperates 12%
of the score from the other score and seperates top 6% of the score
from the other score?
please use TI-84 to solve
The marks on a statistics midterm test are normally distributed with a mean of 75 and...
The marks on a statistics midterm test are normally distributed
with a mean of 75 and a standard deviation of 6. What is the
probability that a sample of 50 exams has an average midterm test
mark that is less than 70?
a. Virtually 0
b. 0.2033
c. -5.89
d. 0.2776
e. Virtually 1
The marks on a statistics midterm test are normally distributed with a mean of 75 and...
The marks on a statistics midterm test are normally distributed
with a mean of 75 and a standard deviation of 6. What is the
probability that a sample of 25 exams has a sample mean between 71
and 73?
a. 0.45293
b. 0.04793
c. 0.0475
d. 0.0485
e. 0.04707
The marks on a statistics midterm test are normally distributed with a mean of 75 and...
The marks on a statistics midterm test are normally distributed
with a mean of 75 and a standard deviation of 6. What is the
probability that a sample of 50 exams has a sample mean between 74
and 75?
a. 0.3810
b. 0.1210
c. 0.4641
d. 0.3790
e. 0.1190
A sample of midterm test results is distributed normally where the mean = 77 and the...
A sample of midterm test results is distributed normally where
the mean = 77 and the variance = 12.
1. What percentage of these scores is between 70 and 80?
2. What raw score is the cutoff for the top 10% of scores?
3. What is the probability of obtaining a score lower than
70?
4. What is the probability of obtaining a score greater than
90?
the score on test for children in an eight grade class is normally distributed with a...
the
score on test for children in an eight grade class is normally
distributed with a mean of 70 and a standard deviation of 4.2
what is the propability a test score is less than a 77?
what test score cuts off the bottom 25%?
what two test score cutoff the middle 65% of the
distribution?
The score for a special personality test are normally distributed with a mean of 60 and...
The score for a special personality test are normally
distributed with a mean of 60 and standard deviation of 6. a) What
is the probability that one person who took the test, chosen at
random, will have scored less than 65? b) Random samples of 16
people who took the test are surveyed. What is the probability that
the mean of these samples is less than 65?
The score on an test from a certain statistics class, ?, is normally distributed with ?=80.8...
The score on an test from a certain statistics class, ?, is
normally distributed with ?=80.8 and ?=8.3.
NOTE: Assume for the purpose of this problem that the score is a
continuous variable. A score can thus take on any value on the
continuum. (In real life, scores are often treated as if they were
continuous values but are actually discrete in most cases.)
(a) Write the event ''a score over 65.8'' in terms of
?: .
(b) Find the probability...
Suppose that the score in a qualifying exam for a certain profession is normally distributed with...
Suppose that the score in a qualifying exam for a certain
profession is normally distributed with mean 80 and standard
deviation 36. Use Excel to find the following probabilities:
b) Find the probability that a student gets a score between 50
and 100.
c) To get an A, a student must score in the top 8%. What is the
minimum score needed to get an A?
d) Find the probability that the average score in a sample of 60
students...
The Math 122 Midterm Exam is coming up. Suppose the exam scores are normally distributed with...
The Math 122 Midterm Exam is coming up. Suppose the exam scores
are normally distributed with a population mean of
73.8% and a standard deviation of 11.3%.
Let's first create a simulation to observe the expected results
for a class of Math 122 students. In Excel, create 25 random
samples of 23 students each. This means you should have 23 entries
in each column, and you should be using columns A - Y. If you need
a refresher for creating...
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