Mattingly "AI & Prompt Design: The Basics of Prompt Design"
Calculating Mean Miles Run Weekly
1. 3.1 - 1
Example 9: Miles Run
Class
Boundaries
Frequency
5.5 - 10.5
10.5 - 15.5
15.5 - 20.5
20.5 - 25.5
25.5 - 30.5
30.5 - 35.5
35.5 - 40.5
1
2
3
5
4
3
2
Below is a frequency distribution of the number of miles
run per week for a sample of individuals. Find the mean.
2. 3.1 - 2
Example 9: Miles Run
Class
Boundaries
Frequency
5.5 - 10.5
10.5 - 15.5
15.5 - 20.5
20.5 - 25.5
25.5 - 30.5
30.5 - 35.5
35.5 - 40.5
1
2
3
5
4
3
2
Below is a frequency distribution of the number of miles
run per week for a sample of individuals. Find the mean.
( )f x
x
f
3. 3.1 - 3
Example 9: Miles Run
Class
Boundaries
Frequency
5.5 - 10.5
10.5 - 15.5
15.5 - 20.5
20.5 - 25.5
25.5 - 30.5
30.5 - 35.5
35.5 - 40.5
1
2
3
5
4
3
2
Below is a frequency distribution of the number of miles
run per week for a sample of individuals. Find the mean.
( )f x
x
f
Sum the frequencies
4. 3.1 - 4
Example 9: Miles Run
Class
Boundaries
Frequency
5.5 - 10.5
10.5 - 15.5
15.5 - 20.5
20.5 - 25.5
25.5 - 30.5
30.5 - 35.5
35.5 - 40.5
1
2
3
5
4
3
2
Below is a frequency distribution of the number of miles
run per week for a sample of individuals. Find the mean.
f = 20
( )f x
x
f
Sum the frequencies
5. 3.1 - 5
Example 9: Continued
Class Frequency, f Midpoint, x
5.5 - 10.5
10.5 - 15.5
15.5 - 20.5
20.5 - 25.5
25.5 - 30.5
30.5 - 35.5
35.5 - 40.5
1
2
3
5
4
3
2
f = 20
f
xf
X
)( Midpoint
6. 3.1 - 6
Example 9: Continued
Class Frequency, f Midpoint, x
5.5 - 10.5
10.5 - 15.5
15.5 - 20.5
20.5 - 25.5
25.5 - 30.5
30.5 - 35.5
35.5 - 40.5
1
2
3
5
4
3
2
( 5.5 +10.5)/2 = 8
f = 20
f
xf
X
)(
7. 3.1 - 7
Example 9: Continued
Class Frequency, f Midpoint, x
5.5 - 10.5
10.5 - 15.5
15.5 - 20.5
20.5 - 25.5
25.5 - 30.5
30.5 - 35.5
35.5 - 40.5
1
2
3
5
4
3
2
( 5.5 +10.5)/2 = 8
(10.5+15.5)/2 = 13
f = 20
f
xf
X
)(
8. 3.1 - 8
Example 9: Continued
Class Frequency, f Midpoint, x
5.5 - 10.5
10.5 - 15.5
15.5 - 20.5
20.5 - 25.5
25.5 - 30.5
30.5 - 35.5
35.5 - 40.5
1
2
3
5
4
3
2
( 5.5 +10.5)/2 = 8
(10.5+15.5)/2 = 13
(15.5+20.5)/2 = 18
f = 20
f
xf
X
)(
9. 3.1 - 9
Example 9: Continued
Class Frequency, f Midpoint, x
5.5 - 10.5
10.5 - 15.5
15.5 - 20.5
20.5 - 25.5
25.5 - 30.5
30.5 - 35.5
35.5 - 40.5
1
2
3
5
4
3
2
( 5.5 +10.5)/2 = 8
(10.5+15.5)/2 = 13
(15.5+20.5)/2 = 18
(20.5+25.5)/2 = 23
f = 20
f
xf
X
)(
10. 3.1 - 10
Example 9: Continued
Class Frequency, f Midpoint, x
5.5 - 10.5
10.5 - 15.5
15.5 - 20.5
20.5 - 25.5
25.5 - 30.5
30.5 - 35.5
35.5 - 40.5
1
2
3
5
4
3
2
( 5.5 +10.5)/2 = 8
(10.5+15.5)/2 = 13
(15.5+20.5)/2 = 18
(20.5+25.5)/2 = 23
(25.5+30.5)/2 = 28
f = 20
f
xf
X
)(