In the group data of brothers and sisters listed as 0, 1, 1, 1, 2, 3, 3, 4, 5, what is the mode?

The mode is defined as the number that appears most frequently in a data set. In the provided data set of siblings: 0, 1, 1, 1, 2, 3, 3, 4, 5, we can analyze the frequency of each number:

• 0 appears once

• 1 appears three times

• 2 appears once

• 3 appears twice

• 4 appears once

• 5 appears once

Among these numbers, the number 1 has the highest frequency, appearing three times, which surpasses any other number's count. Therefore, the mode of this data set is 1, as it is the value that occurs most often.