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To determine the correct Excel formula for calculating the relative frequency as a decimal, we need to understand the concept of relative frequency first.

### Concept:
**Relative Frequency** is calculated as the ratio of the frequency of a particular class to the total number of observations.

### Given:
- The total number of observations is stored in cell `B9`.
- The frequency of a particular class is stored in cell `B2`.

### Formula Options:
- **Option 1:** `=B2/B9` (Correct Formula)
  - This formula divides the frequency of the particular class (`B2`) by the total number of observations (`B9`), giving you the relative frequency as a decimal.
  
- **Option 2:** `=B9/B2`
  - This formula incorrectly divides the total number of observations by the class frequency, which does not represent relative frequency.
  
- **Option 3:** `=B9/B2`
  - This is the same as option 2 and is incorrect for the same reason.
  
- **Option 4:** `=B2/B9*10`
  - This formula multiplies the relative frequency by 10, which would give you a proportion scaled up by a factor of 10, not a simple decimal form.

### Correct Answer:
- The correct Excel formula is **`=B2/B9`**.

Would you like to explore this concept further, or do you have any more questions?

### Follow-Up Questions:
1. How can you convert relative frequency into a percentage in Excel?
2. What is the difference between absolute and relative frequency?
3. How can you calculate cumulative frequency using Excel?
4. What would be the effect of missing data on the calculation of relative frequency?
5. How would you create a frequency distribution table in Excel?

**Tip:** When working with data in Excel, always ensure your formulas correctly reflect the operation you intend to perform, especially when dealing with ratios and proportions.

Discover the correct Excel formula for calculating relative frequency as a decimal. Understand the concept of relative frequency and learn how to apply it with a step-by-step guide. Suitable for advanced learners.

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