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Here is the probability model for the blood type of a randomly chosen person in the United States.

\begin{tabular}{|c|c|c|c|c|}
\hline Blood type & O & A & B & AB \\
\hline \hline Probability & 0.58 & 0.15 & 0.02 & 0.25 \\
\hline
\end{tabular}

What is the probability that a randomly chosen American does not have type O blood?

Round to the nearest [tex]$0.01\%$[/tex].


Sagot :

Sure, let's solve this step by step.

Given the probabilities of blood types in the United States:
- Probability of blood type O, [tex]\( P(O) = 0.58 \)[/tex]
- Probability of blood type A, [tex]\( P(A) = 0.15 \)[/tex]
- Probability of blood type B, [tex]\( P(B) = 0.02 \)[/tex]
- Probability of blood type AB, [tex]\( P(AB) = 0.25 \)[/tex]

We are asked to find the probability that a randomly chosen American does not have type O blood.

The probability that an individual does not have type O blood is given by the complement of the probability of having type O blood. In other words:

[tex]\[ \text{Probability of not having type O blood} = 1 - P(O) \][/tex]

Substituting the given value:

[tex]\[ \text{Probability of not having type O blood} = 1 - 0.58 \][/tex]

Performing the subtraction:

[tex]\[ \text{Probability of not having type O blood} = 0.42 \][/tex]

To express this probability as a percentage, we multiply by 100:

[tex]\[ \text{Probability of not having type O blood (as a percentage)} = 0.42 \times 100 \][/tex]

[tex]\[ \text{Probability of not having type O blood (as a percentage)} = 42 \% \][/tex]

Finally, rounding to the nearest [tex]\( 0.01 \% \)[/tex]:

[tex]\[ \text{Rounded probability} = 42.00 \% \][/tex]

Thus, the probability that a randomly chosen American does not have type O blood, rounded to the nearest [tex]\( 0.01 \% \)[/tex], is [tex]\( 42.00\% \)[/tex].
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