Final answer:
The events in order from least to most likely for Gustavo's home runs are: 0-19 home runs, 40+ home runs, and 20-39 home runs based on their respective probabilities of 25%, 30%, and 45%.
Step-by-step explanation:
The student asked to put the following events in order from least to most likely for Gustavo, the league's home run leader: 20-39 home runs, 0-19 home runs, and 40+ home runs based on the given probabilities. To sort the events:
0-19 home runs = 1/4 or 25%
40+ home runs = 0.3 or 30%
20-39 home runs = 45%
Therefore, the order from least to most likely is:
0-19 home runs
40+ home runs
20-39 home runs