Refer to the table below given that 2 of the 114 subjects are randomly selected
ID: 3431119 • Letter: R
Question
Refer to the table below given that 2 of the 114 subjects are randomly selected
Rh+
O
33
A
29
B
12
AB
12
Rh-
11
9
4
4
Assumed that a selection is made with replacement. What are the probability that that 2 selected subjects are both group B and type Rh+?
Assumed that a selection is made without replacement. What are the probability that that 2 selected subjects are both group B and type Rh+?
Rh+
O
33
A
29
B
12
AB
12
Rh-
11
9
4
4
Explanation / Answer
Probability that a random selection is both group B and type Rh+ =(12/114) = 2/19
For replacement case:
the probability that that 2 selected subjects are both group B and type Rh+ = 2/19 * 2/19 = 4/361= 0.01108
For without replacement case:
the probability that that 2 selected subjects are both group B and type Rh+ = (12/114)*(11/113)= 2/19 * 11/113= 22/2147=0.010247
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