Data Visualizationeasy
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A histogram of daily website traffic (in visitors) across 100 days shows:

[0–500): 15 days | [500–1000): 30 days | [1000–1500): 35 days | [1500–2000): 15 days | [2000–2500): 5 days

What is the relative frequency of days with 1000–1500 visitors?