The following are a list of ages of
players on a baseball team:
19
39
31
20
22
39
30
27
25
Please make a dot-plot of these ages.
19
39
31
20
22
39
30
27
25
1. Select a single number to represent all of the numbers
graphed above.
2. Select a single number to represent the center of this
distribution.
Explain how you chose each of these numbers.
Three Methods to Measure
the Center of a Distribution
• Mean - The ordinary “average”, found by adding
all up all of a given set of numbers and dividing by
the amount of numbers added.
• Median - The middle number once all of the
numbers are arranged in order from smallest to
largest.
• Mode - The number that appears the most
frequently in a set of numbers.
Find the Mean, Median and Mode of this
set of numbers:
19
19
39
30
+
+
31
20
20
31
Mean:
252
9
Median:
27
+
+
22
22
39
39
39
+
+
30
25
27
39
39
27
+ 25
27
= 252
Middle Number
=
28
Mode:
29
Find the Mean, Median and
Mode of the Following Numbers:
12
42
17
29
81
26
19
40
47
66
24
37