Weight (Class Interval)	Frequency (f)	Relative Frequency (f/n)	Cumulative Frequency (CF)	Percentile Rank (%)
45 - 49	1	1/30 = 0.033	1	3.33

Let's complete the table step-by-step, ensuring that all columns are correctly filled.

### Given Data:
- **Class Interval**: 45 - 49
- **Frequency (f)**: 1
- **Relative Frequency (f/n)**: \( \frac{1}{30} = 0.033 \)
- **Cumulative Frequency (CF)**: 1
- **Percentile Rank (%)**: 3.33

### Understanding the Columns:
1. **Frequency (f)**: Number of observations in each class interval.
2. **Relative Frequency (f/n)**: The ratio of frequency to the total number of observations (30 in this case).
3. **Cumulative Frequency (CF)**: The sum of frequencies up to the current class interval.
4. **Percentile Rank (%)**: Shows the percentage of data points below a certain class interval. It's calculated as:
   
   \[
   \text{Percentile Rank} = \left(\frac{\text{CF}}{n}\right) \times 100
   \]

### Calculation for the Row:
1. **Relative Frequency**:
   - \( \frac{1}{30} = 0.033 \), which is already provided.

2. **Cumulative Frequency**:
   - Since it's the first class interval, the CF is just the frequency, i.e., 1.

3. **Percentile Rank**:
   - Use the formula:

     \[
     \text{Percentile Rank} = \left(\frac{1}{30}\right) \times 100 = 3.33
     \]

The given row calculations are correct. 

### Completing Additional Rows:
Would you like assistance in completing the full table with further class intervals, frequencies, relative frequencies, cumulative frequencies, and percentile ranks?

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Here are some related questions to expand on this topic:

1. How do you determine the total number of observations from a frequency distribution table?
2. How can you calculate cumulative frequencies for a series of class intervals?
3. What is the significance of the percentile rank in statistical data analysis?
4. How would you interpret the percentile rank of a specific class interval in real-world scenarios?
5. What are the common errors to watch out for when creating frequency distribution tables?

**Tip:** Always double-check cumulative frequency and percentile rank calculations, as errors in one row can affect subsequent values.

Weight (Class Interval) Frequency (f) Relative Frequency (f/n) Cumulative Frequency (CF) Percentile Rank (%) 45 - 49 1 1/30 = 0.033 1 3.33

Learn how to complete a frequency distribution table with class intervals, frequencies, relative frequencies, cumulative frequencies, and percentile ranks. This example demonstrates calculating relative frequency and percentile rank for the weight class interval 45 - 49, with a total sample size of 30. Suitable for students in Grades 9-12.

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