The question is asking which number one quarter (25%) of the data values are less than, based on the box-and-whisker plot.

In a box-and-whisker plot:

• The first quartile (Q1) represents the value below which 25% of the data lies.
• In this plot, the value at the first quartile (Q1) is marked at 75.

Therefore, one quarter of the data numbers are less than 75.

Would you like further details or have additional questions?

Here are some related questions to deepen understanding:

1. What does the third quartile (Q3) represent in a box-and-whisker plot?
2. How can you determine the median from a box-and-whisker plot?
3. What does the range of the data tell us in this plot?
4. How do outliers affect a box-and-whisker plot?
5. What are the differences between quartiles and percentiles?

Tip: In a box-and-whisker plot, each "quartile" section (left whisker, box left half, box right half, right whisker) represents 25% of the data.