Question

blood is classified by blood type (either a, b, ab or o) and by rh - level as either rh+ or rh-. a phlebotomist classified the blood type and rh - level of the blood of 500 individuals. the data obtained are shown in the contingency table below.

	blood type
rh-	30	4	12	30	76
rh+	176	22	28	198	424
total	206	26	40	228	500

what proportion of people with rh+ level were classified as having blood type o?

198/424
228/500
198/500
198/228

Explanation:

Step1: Identify relevant values

Number of Rh+ with blood - type O is 198, total number of Rh+ is 424.

Step2: Calculate proportion

Proportion = $\frac{198}{424}$

Answer:

198/424