Which percentile equals `D_7`?

Answer

To find which percentile equals \( D_7 \) (the seventh decile), we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Definitions**:
- A **percentile** divides a dataset into 100 equal parts. For example, the 70th percentile means that 70% of the data falls below this value.
- A **decile** divides a dataset into 10 equal parts. Therefore, each decile represents 10% of the data.

2. **Identify the Meaning of \( D_7 \)**:
- \( D_7 \) refers to the seventh decile. This means it is the value below which 70% of the data falls.

3. **Convert Decile to Percentile**:
- Since each decile represents 10% of the data, the seventh decile \( D_7 \) corresponds to 70% of the data.
- Therefore, \( D_7 \) is equivalent to the 70th percentile.

4. **Conclusion**:
- Thus, we can conclude that \( D_7 \) equals the 70th percentile.

### Final Answer:
The percentile that equals \( D_7 \) is the **70th percentile**.