STAT 101 SEU Assignment 2 Weeks: 5-7 Standard Deviation there are 6 simple questions whuch need to be fully solved CSTS-SEU-KSA ___________________________ | Homework Answers
STAT 101 SEU Assignment 2 Weeks: 5-7 Standard Deviation there are 6 simple questions whuch need to be fully solved CSTS-SEU-KSA
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Statistics (STAT-101)
Assignment-2 (Weeks: 5-7)
2nd Semester, 1439-1440 (2018-2019)
Due date :23/02/2019 (Time: 11:00 AM)
Students Name
Students ID
Section/CRN
Location
Marking Scheme
Question
Score
Q-1
3
Q-2
3
Q-3
3
Q-4
3
Q-5
3
Q-6
3
Total
18
Obtained Score
Note: You are required to fill your full name, ID and CRN.
CSTS-SEU-KSA
Solve the following questions
?? × ?? ???????? = ???? ????????
1. In a class on 50 students, 35 students passed in all subjects, 5 failed in one subject, 4
failed in two subjects and 6 failed in three subjects.
a. Construct a probability distribution table for number of subjects a student from the
given class has failed in.
b. Calculate the Standard Deviation.
Solution:
2. 45 % of the employees in a company take public transportation daily to go to work. For
a random sample of 7 employees, what is the probability that at most 2 employees take
public transportation to work daily?
Solution:
CSTS-SEU-KSA
3. Find
a) ??(?? < 1.87)
b) ??(?? > ?1.01)
c) ??(?1.01 < ?? < 1.87)
Solution:
4. Assume the population of weights of men is normally distributed with a mean of
175 lb. and a standard deviation 30 lb. Find the probability that 20 randomly
selected men will have a mean weight that is greater than 178 lb.
Solution:
CSTS-SEU-KSA
5.
We have a random sample of 100 students and 75 of these people have a weight less than 80
kg. Construct a 95% confidence interval for the population proportion of people who have a
weight less than 80 kg.
Solution:
6. We have a sample of size n = 20 with mean ??? = 12 and the standard deviation ?? = 2. What
is a 95% confidence interval based on this sample?
Solution:
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