To complete the statements about percentiles:

1. The first quartile (Q1) corresponds to the 25th percentile.
2. The median corresponds to the 50th percentile.
3. The third quartile (Q3) corresponds to the 75th percentile.

These percentiles represent points in a data set where specific percentages of the data fall below them.

Would you like more details on how quartiles and percentiles are calculated or have any other questions? Here are some related questions to consider:

1. What is the difference between a percentile and a quartile?
2. How are quartiles used in descriptive statistics?
3. How do you calculate the quartiles for a given data set?
4. What is the interquartile range (IQR), and how is it useful?
5. How do outliers affect the calculation of quartiles?

Tip: Quartiles help summarize a data set by dividing it into four equal parts, providing a clearer picture of its distribution.