We determine the marginal relative frequencies using Maria's table:

\(\begin{array}{c|c}&Yes&No&\text{Total}\\\hline\text{Children}&0.15&0.25&0.40\\\hline\text{Adults}&0.1&0.6&0.7\\\hline\text{Total}&0.25&0.85&1.1\end{array}\)

We determine the marginal relative frequencies using Brennan's table:

\(\begin{array}{c|c}&Yes&No&\text{Total}\\\hline\text{Children}&0.15&0.25&0.40\\\hline\text{Adults}&0.1&0.5&0.6\\\hline\text{Total}&0.25&0.75&1.0\end{array}\)

Maris's table is wrong because the number in the lower right cell is not 1. Brennan's table is correct.

Result: Maria's table