Refer to the table below. Given that 2 of the 231 subjects are randomly selected

Question

Refer to the table below. Given that 2 of the 231 subjects are randomly selected, complete parts (a) and (b).

Group

O A B AB

Rh+ 65 68 29 19

Rh- 22 19 5 4

(a) Assume that the selections are made WITH replacement. What is the probability that the 2 selected subjects are both group O 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 O and type Rh+?

Round to four decimal places as needed.

Explanation / Answer

a) With replacement p(selecting 2 subjects ) = (65/232)(65/231)

= (65/231)^2

= 0.079

b) with out replacement

p(selecting 2 subjects ) = (65/231)(64/230) = 0.0783

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