Question

The table summarizes the distribution of age and assigned group for 90 participants in a study.
$\begin{array}{|c|c|c|c|c|} \hline & 0\!-\!9 \ \text{years} & 10\!-\!19 \ \text{years} & 20+\ \text{years} & \text{Total} \\ \hline \text{Group A} & 15 & 11 & 4 & 30 \\ \hline \text{Group B} & 4 & 5 & 21 & 30 \\ \hline \text{Group C} & 11 & 14 & 5 & 30 \\ \hline \text{Total} & 30 & 30 & 30 & 90 \\ \hline \end{array}$

One of these participants will be selected at random. What is the probability of selecting a participant from group A, given that the participant is at least 10 years of age?

Accepted Answer

1/4

Answer

1/6

Answer

11/30

Answer

1/2

Question Bank

Question Bank

SAT Probability and conditional probability practice question

Explanation