2/26/2014
Print Test
1/6
PRINTABLE VERSION
Test 1
You scored 12 out of 24
Question 1
Your answer is CORRECT.
True or False:
Let
X
be the random variable assigned to the number of days it rained where you live last month.
X
is a
continuous random variable.
a)
True
b)
False
Question 2
Your answer is CORRECT.
True or False:
If the largest value in a data set that contains strictly positive values is doubled, the range will increase.
a)
True
b)
False
Question 3
Your answer is INCORRECT.
A researcher randomly selects 3 fish from among 10 fish in a tank and puts each of the 3 selected fish
into different containers. How many ways can this be done?
a)
90
b)
240
c)
2160
d)
2880

2/26/2014
Print Test
2/6
e)
720
Question 4
Your answer is CORRECT.
Records at the UH library show that 16% of all UH students check out books on history, 20% of all UH
students check out books on science, and 4% check out books on both history and science. What is the
probability that a randomly selected UH student checks out a history book or a science book or both?
a)
0.64
b)
0.40
c)
0.28
d)
0.32
e)
0.36
Question 5
Your answer is INCORRECT.
Suppose that
x
is normally distributed with a mean of 60 and a standard deviation of 9. What is P(
x
≥
72.15)?
a)
0.411
b)
0.093
c)
0.089
d)
0.911
e)
0.090
Question 6
Your answer is CORRECT.
This is a written question, worth 10 points. DO NOT place the problem code on the answer sheet.
A proctor will fill this out after exam submission. Show all steps (work) on your answer sheet for
full credit.

#### You've reached the end of your free preview.

Want to read all 6 pages?

- Fall '08
- Staff
- Statistics, Normal Distribution, Standard Deviation, Variance, Probability theory