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The relative frequency of Hazel's t-shirts can be calculated by dividing the number of t-shirts by the total number of tops in her wardrobe:
Relative frequency of t-shirts = Number of t-shirts / (Number of t-shirts + Number of blouses)
Relative frequency of t-shirts = 15 / (15 + 10)
Relative frequency of t-shirts = 15 / 25
Relative frequency of t-shirts = 0.6 or 60%
Therefore, the relative frequency of Hazel's t-shirts in her wardrobe is 60%.