the table shows the blood types of 75 donors after a one-day blood drive. based on the result, what is the chance that a random donor has type A blood?

Question

blood type - O A B AB
Frequency - 31 33 9 2

11/25
33
31/75
7/15

Answer 1

To find the chance that a random donor has type A blood, we need to calculate the ratio of donors with type A blood to the total number of donors.

From the data given:

• Number of donors with type A blood = 33
• Total number of donors = 75

Now, we can calculate the probability:

\[ \text{Probability of type A blood} = \frac{\text{Number of type A donors}}{\text{Total number of donors}} = \frac{33}{75} \]

Next, we can simplify this fraction:

\[ \frac{33}{75} = \frac{11}{25} \]

Therefore, the chance that a random donor has type A blood is 11/25.