$$\begin{array} {|c|c|} \hline \text{Weight range, in pounds} & \text{Frequency} \\ \hline \hline \text{ lower than 1.5 } & 2 \\ \hline 1.5 \text{ up to } 2.5 & 7 \\ \hline 2.5 \text{ up to } 3.5 & 13 \\ \hline 3.5 \text{ up to } 4.5 & 22 \\ \hline \text{ greater than } 4.5 & 6 \\ \hline \end{array}$$

A scientist caught, weighed, and released 50 bullfrogs to collect data. A summary of the data is shown in the table above. Which of the following could be the median weight, in pounds, of the bullfrogs caught?

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Since there are 50 bullfrogs in the frequency table, we need to find the 25^th and 26^th bullfrog weight and average them to find the median. The table does not give exact weights, but both the 25^th and 26^th bullfrog must be in the weight range 3.5 up to 4.5.

We know this because there are $2+7+13=22$ frogs that weigh 2.5 pounds or lower. The next 22 frogs that weigh more are in the next weight range. Therefore, the 25^th and 26^th bullfrogs must be in the next weight range.

$$\begin{array} {|c|c|} \hline \text{Weight range, in pounds} & \text{Frequency} \\ \hline \hline \colorbox{aqua}{$\text{ lower than 1.5 }$} & \colorbox{aqua}{$2$} \\ \hline \colorbox{aqua}{$1.5 \text{ up to } 2.5$} & \colorbox{aqua}{$7$} \\ \hline \colorbox{aqua}{$2.5 \text{ up to } 3.5$} & \colorbox{aqua}{$13$} \\ \hline \colorbox{yellow}{$3.5 \text{ up to } 4.5$} & \colorbox{yellow}{$22$} \\ \hline \text{ greater than } 4.5 & 6 \\ \hline \end{array}$$