Relative frequency approximation Blood Types

4.1 - 1Copyright © 2010, 2007, 2004 Pearson Education, Inc. All Rights Reserved.
Example: Blood Types
In a sample of 50 people, 21 had type O blood, 22 had type A
blood, 5 had type B blood, and 2 had type AB blood. Set up a
frequency distribution and find the following probabilities.
a. A person has type O blood.
Type Frequency
A 22
B 5
AB 2
O 21
Total 50

Type Frequency
A 22
B 5
AB 2
O 21
Total 50

b. A person has type A or type B blood.
Type Frequency
A 22
B 5
AB 2
O 21
Total 50

Type Frequency
A 22
B 5
AB 2
O 21
Total 50

Type Frequency
A 22
B 5
AB 2
O 21
Total 50

22 5
50
27
50
54%

c. A person has neither type A nor type O blood.
Type Frequency
A 22
B 5
AB 2
O 21
Total 50

Type Frequency
A 22
B 5
AB 2
O 21
Total 50

d. A person does not have type AB blood.
Type Frequency
A 22
B 5
AB 2
O 21
Total 50

Type Frequency
A 22
B 5
AB 2
O 21
Total 50

Type Frequency
A 22
B 5
AB 2
O 21
Total 50

22 5 21
50
48
50

d. A person does not have type AB blood. Alternative Solution
Since there are 50 total people in the population and 2 with Type AB
blood, then 50 – 2 = 48 people do not have Type AB blood
Type Frequency
A 22
B 5
AB 2
O 21
Total 50

50 2
50
48
50
96%

Relative frequency approximation Blood Types

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Relative frequency approximation Blood Types