Refer to the table below. Given that 2 of the 242 subjects are randomly selected
ID: 3437234 • Letter: R
Question
Refer to the table below. Given that 2 of the 242 subjects are randomly selected, complete parts (a) and (b).
Group
O A B AB
Type Rh+ 82 81 19 22
Rh- 17 15 4 2
A. Assume that the selections are made with replacement. What is the probability that the 2 selected subjects are both group AB and type Rh+? (round to four decimal places as needed)
B. Assume the selections are made without replacement. What is the probability that the 2 selected subjects are both group AB and type Rh+? (round to four decimal places as needed)
Explanation / Answer
Total number of person with the AB and Rh+ is 22 and the total sample population is 242
P(AB and Rh+) =22/242
A)With replacement =>
When selected subject choosen is firse AB and Rh+ =>P(AB and Rh+)=22/242
With replacement the probability =(22/242)^2 =.09^2 =.00826
B)Without replacement ,the probability is 22/242*21/241 =(22*21)/(242*241)=.0079
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