To find the relative frequency of Hazel's T-shirts, we first need to determine the total number of clothing items she has, which is the sum of her T-shirts and short-sleeve blouses.
Hazel has:
- 15 T-shirts
- 10 short-sleeve blouses
Total number of items = 15 + 10 = 25
Now, we calculate the relative frequency of her T-shirts by dividing the number of T-shirts by the total number of items:
\[ \text{Relative frequency of T-shirts} = \frac{\text{Number of T-shirts}}{\text{Total number of items}} = \frac{15}{25} \]
Calculating this gives:
\[ \frac{15}{25} = 0.6 \]
Thus, the relative frequency of her T-shirts in decimal form is:
0.6