Question: Suppose that a population has μ = 50 and σ= 10.
a) What is the Z value for x = 75?
b) What is the Z value for x = 40?
The next two questions refer to the following table where x= the number of days per week that 100 clients use a particular exercise facility.
|
X (# of days)
|
Frequency (# of people)
|
Cumulative Frequency
|
|
0
|
3
|
|
|
1
|
12
|
|
|
2
|
33
|
|
|
3
|
28
|
|
|
4
|
11
|
|
|
5
|
9
|
|
|
6
|
4
|
|
a. Complete the column of cumulative frequency
b. What is the 80th percentile?
c. Find the interquartile range.
d. Find the mean and standard deviation