Answer:
First 25% 10 - 22.5
Next 25% 22.5 - 35
Third 25% 35 - 47.5
Last 25% 47.5 - 60
Explanation:
First get the median of the entire data.
From the median, you split the data into two and find the median for both sections.
Finally, your smallest median is your first 25% and so on.