Problem
Human blood can contain the A antigen, the B antigen, both the A and B antigens, or neither antigen. It may or may not also contain the Rh antigen. Blood is called type A-positive if the individual has the A and $R h$ but not the $B$ antigen. A person having only the $A$ and $B$ antigens is said to have type AB-negative blood. A person having only the Rh antigen has type O-positive blood. Other blood types are defined in a similar manner. In a certain hospital, the data, shown to the right, was recorded Use a Venn diagram to answer parts (a) through (h) about the blood samples. For parts (d) through (h), the presence or absence of antigens determines blood type. (a) How many samples were represented? samples $\begin{aligned} \text { \# of Samples } & \text { Antigen in Blood } \\ 16 & \text { A } \\ 7 & \text { A and B } \\ 28 & \text { B } \\ 11 & \text { B and Rh } \\ 20 & \text { Rh } \\ 12 & \text { None } \\ 7 & \text { A and Rh } \\ 4 & \text { A, B, and Rh }\end{aligned}$ 3
Solution
Step 1 ：The question is asking for the total number of samples represented in the data. To find this, we need to add up all the numbers given in the data.
Step 2 ：\[ \text{{samples}} = [16, 7, 28, 11, 20, 12, 7, 4] \]
Step 3 ：\[ \text{{total_samples}} = 105 \]
Step 4 ：Final Answer: The total number of samples represented in the data is \(\boxed{105}\)
