Question 7 (1 point)
The rainfall in Aberdeen Reservoir, Washington (the wettest
place in the contiguous United States) averages 137.36 inches per
year with a standard deviation of 6.27 inches. According to the
Central Limit Theorem, what happens to the histogram of averages as
n increases?
Question 7 options:

1)

The histogram will begin to look more like
the normal curve. 


2)

The histogram will begin to look less like
the normal curve. 


3)

Increasing n will not affect the histogram
of averages. 


4)

It depends on the mean and standard
deviation. 


5)

The histogram will begin to look more like
the original distribution. 

Question 8 (1 point)
Historically, the average score of PGA golfers for one round is
71.1 with a standard deviation of 3.05. A random sample of 73
golfers is taken. What is the probability that the sample mean is
greater than 71?
Question 8 options:
Question 9 (1 point)
Energetic Co., a battery manufacturer, claims their battery
lasts for 66.04 months with a standard deviation of 14.205 months.
You randomly sample 25 of these batteries. Assuming the
distribution for the battery lifetime is approximately normal, what
is the probability the average lifetime is less than 68.01?
Question 9 options:
Question 10 (1 point)
Fill in the blank. Suppose that the average starting salary for
student with an Economics degree is $51,043.48 with a standard
deviation of $9,925.81. A random sample of 159 recent graduates
with a job is taken. There is a 23% chance that the average salary
is greater than $ ________.
Question 10 options:





3)

There is not enough information to
determine this. 





Question 11 (1 point)
Fill in the blank. In a drive thru performance study, the
average service time for McDonald's is 203.21 seconds with a
standard deviation of 5.67 seconds. A random sample of 90 times is
taken. There is a 51% chance that the average drivethru service
time is less than ________ seconds.
Question 11 options:

1)

There is not enough information to
determine this. 








