Step-by-step explanation
By definition, the mode/s is/are the value/s that appear most frequently in a data set.
Ordering the given data set, we have:
![40,40,42,48,54,61,65,72,76,78,84,84.](https://img.qammunity.org/2023/formulas/mathematics/college/vw1v8hjs2io7xaiz0dg1y6fqt1943p7ive.png)
We see that the most repeated values are 40 and 84. We conclude that the modes are 40 and 84.
Answer
40 and 84