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The question asks to determine the value of the lower quartile from the box plot.

### Analysis of the box plot:
- The **box plot** is a statistical tool that displays the distribution of a dataset.
- The key parts of a box plot are:
  - **Minimum value** (15 in this case).
  - **Lower quartile (Q1)** – This is the value at the first quartile (25th percentile).
  - **Median (Q2)** – This is the value at the second quartile (50th percentile, given as 23).
  - **Upper quartile (Q3)** – This is the value at the third quartile (75th percentile).
  - **Maximum value** (excluding outliers, 35 in this case).
  
The value of **Q1 (lower quartile)** is typically found at the left boundary of the box.

### Observing the box plot:
- The lower boundary of the box is at 20. 
- Thus, the **lower quartile (Q1)** is **20**.

### Correct Answer:
The correct option is **B) 20**.

Would you like more details or have any questions? 

Here are 5 related questions:
1. What is the significance of each part of the box plot (whiskers, box, median)?
2. How can you calculate quartiles for a dataset?
3. What is the difference between an outlier and a regular data point on a box plot?
4. How do we interpret the spread of data from the length of the box?
5. What are other ways to represent data distribution besides box plots?

**Tip:** Box plots are excellent for identifying outliers and understanding the spread of data visually.

Dari box plot tersebut dapat diketahui bahwa nilai quartil bawah adalah ....

In this problem, you will learn how to determine the lower quartile (Q1) using a box plot. The key parts of the box plot include the minimum value, Q1, median (Q2), Q3, and maximum value. The lower quartile in this case is 20.

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