Question

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?

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

Answer 1

To find the probability that a random donor has type A blood, you can use the formula for probability:

\[
P(\text{A}) = \frac{\text{Number of donors with type A}}{\text{Total number of donors}}
\]

From the table:

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

Now, plug the numbers into the formula:

\[
P(\text{A}) = \frac{33}{75}
\]

Now, calculate the fraction:

\[
P(\text{A}) = \frac{33 \div 3}{75 \div 3} = \frac{11}{25}
\]

To convert this to a decimal:

\[
P(\text{A}) = 0.44
\]

So the probability that a random donor has type A blood is \(0.44\) or \(44\%\).