From the box-and-whisker plot, we can identify the lower quartile, also known as Q1, which is represented by the left edge of the box.

Observations from the plot:

• The left edge of the box is aligned with 40 on the number line.

Conclusion:

The value of the lower quartile (Q1) is 40.

Would you like a detailed explanation of how quartiles are derived from such plots?

Related Questions:

1. How are the median and upper quartile identified in a box-and-whisker plot?
2. What does the range of the whiskers tell us about the data set?
3. How do you calculate the interquartile range (IQR) from a box plot?
4. Can the lower quartile be used to identify outliers in the data?
5. What is the significance of each part of a box-and-whisker plot?

Tip:

Always ensure to differentiate between the whiskers and the edges of the box; they represent different aspects of the data distribution!