Two-way tables
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A primary school class was surveyed on whether its students could swim. The results are shown below.
\begin{array}{|c|c|c|}
\hline & \text { Can swim } & \text { Cannot swim } \\
\hline \text { Boys } & 24 & 5 \\
\hline \text { Girls } & 16 & 3 \\
\hline
\end{array}
a. How many students are in the class?
b. How many students are boys and cannot swim?
c. How many students are boys or cannot swim?
d. What is the probability that a student randomly selected from this class is a girl?
e. What is the probability that a student selected at random is a non-swimmer?
f. What is the probability that a student selected at random is a girl who can swim?
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