Question
In: Statistics and Probability
For the following assume the results of an exam has a mean of 75 and a...
For the following assume the results of an exam has a mean of 75 and a standard deviation of 5.
1. Calculate the percentage of students that score above 75.
2. Calculate the percentage of students that score below 65.
3. Calculate the percentage of students that score above 80.
4. The genius people in the class get a score in the top 1%. Calculate the score of the genius people.
5. Calculate the scores that you need to be between to be in the middle 80%.
6. Calculate the value of μ-2σ and μ+2σ. If a number is above μ+2σ it is considered an unusual value. If a number is below μ-2σ it is also considered an unusual value. These unusual values are also known as statistically significant. Determine if 83, 85, 87, 55, 64, 70, and 74 are statistically significant
Solutions
orchestra answered 2 years agoRelated Solutions
for a final exam in statistics , the mean of the exam scores is u= 75...
for
a final exam in statistics , the mean of the exam scores is u= 75
with a standard deviation of o=8. what sample mean marks the top
10% of this distribution for a samples of n= 25
b) what sample means mark the boundaries of the middle 50% for
samples of n= 50
A distribution of exam scores has a mean of M = 75.If your score is X...
A distribution of
exam scores has a mean of M = 75.If your score is
X = 86, which standard deviation would give you a better
grade: s = 4 or s = 2?
a.
4
b.
2
c.
Both would give you the same grade
d.
Not enough information is given
Given the scores on a certain exam are normally distributed with a mean of 75 and...
Given the scores on a certain exam are normally distributed with
a mean of 75 and a standard deviation of 5
a. Calculate the z-score for 80. Find the percentage of students
with scores above 80
b. Calculate the z-score for 60. Find the percentage of students
with scores below 60.
c. Calculate the z-scores for 70 and 90. Find the percentage of
students with scores between 70 and 90.
d. What is the median?
e. What test score value...
Suppose the mean grade for a statistics midterm exam was 75, with a standard deviation of...
Suppose the mean grade for a statistics midterm exam was 75,
with a standard deviation of 10. Assume that your grades were
normally distributed.
a. What percentage of students received at least an 90?
e. If 2 students failed the exam, i.e. their grades were less
than 60, how many students took the test? Hint: First focus on
p(x<60).
You were told that the mean score on a statistics exam is 75 with the scores...
You were told that the mean score on a statistics exam is 75
with the scores normally distributed. In addition, you know the
probability of a score between 55 and 60 is 4.41% and that the
probability of a score greater than 90 is 6.68%. What is the
probability of a score between 55 and 95?
data: (if needed) Race Position Oral exam results Written exam results Combined results B Lieutenant 45.83 ...
data: (if needed)
Race Position Oral exam
results Written exam results Combined
results
B Lieutenant 45.83
46 45.932
B Lieutenant 52.92
49 50.568
B Captain 54.76 49
51.304
H Lieutenant 48.33
58 54.132
B Lieutenant 52.08
56 54.432
H Lieutenant 40.83
64 54.732
B Captain 60 53
55.8
W Captain 53.81 58
56.324
B Lieutenant 58.75
55 56.5
W Lieutenant 54.58
58 56.632
B Lieutenant 55.83
58 57.132
W Lieutenant 45.42
65 57.168
H Lieutenant 44.17
66 57.268
H Captain ...
Data: (if needed) Race Position Oral exam results Written exam results Combined results B Lieutenant 45.83 ...
Data: (if needed)
Race Position Oral exam
results Written exam results Combined
results
B Lieutenant 45.83
46 45.932
B Lieutenant 52.92
49 50.568
B Captain 54.76 49
51.304
H Lieutenant 48.33
58 54.132
B Lieutenant 52.08
56 54.432
H Lieutenant 40.83
64 54.732
B Captain 60 53
55.8
W Captain 53.81 58
56.324
B Lieutenant 58.75
55 56.5
W Lieutenant 54.58
58 56.632
B Lieutenant 55.83
58 57.132
W Lieutenant 45.42
65 57.168
H Lieutenant 44.17
66 57.268
H Captain ...
Assume that population mean is to be estimated from the sample described. Use the sample results...
Assume that population mean is to be estimated from the sample
described. Use the sample results to approximate the margin of
error and 95% confidence interval n=49.x=63.2 seconds, s=4.5
seconds Find the 95% confidence interval
_____seconds<y<____seconds (Round to one decimal place as
needed)
Assume that population mean is to be estimated from the sample described. Use the sample results...
Assume that population mean is to be estimated from the sample
described. Use the sample results to approximate the margin of
error and 95% confidence interval. n=36, x=61.2 seconds, s=4.14
seconds
Margin of error is 1.4 seconds, what is the 95% confidence
interval?
? seconds <μ< ? seconds?
Assume that population mean is to be estimated from the sample described. Use the sample results...
Assume that population mean is to be estimated from the sample
described. Use the sample results to approximate the margin of
error and 95% confidence interval.
Sample size,
nequals=100100;
sample mean,
x overbarxequals=77.077.0
cm; sample standard deviation,
sequals=5.05.0
cm
ADVERTISEMENT
ADVERTISEMENT
Latest Questions
- Look up and use each of these Linux commands. (Each command will have two parts) Summarize...
- What was Lincoln 10 percent plan and what problems did it present?
- A cantilever beam 4m long carries a uniform load of 3.5 kN/m over a portion 1.5m...
- Our next optimization comes from using the brilliant Rabin-Karp substring matching algorithm (RK for short), invented...
- Give an example of an experiment to determine the focal length of a concave lens. (Note...
- Search the Internet to find (at least 2 websites) related to the general field of malware....
- Consider the following schema: Suppliers(sid, sname, address) Parts(pid, pname, color) Catalog(sid, pid, cost) write the following...
ADVERTISEMENT