What is the frequency for the first class (A)?

The frequency for the first class (A), which corresponds to the interval 80-109, can be determined by counting the number of data points that fall within this range.

### Interval 80-109:
The data points within this interval are: **80, 100, 100, 100, 80, 90, 90**.

### Frequency Calculation:
There are **7** data points in the interval 80-109.

### Answer:
The frequency for the first class (A) is **7**.

Would you like further details or explanations on any of these calculations?

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**Related Questions:**

1. How does the frequency of the first class compare to other classes?
2. Why might the frequency be higher in the first class compared to others?
3. How would a change in the class interval affect the frequency distribution?
4. Can you calculate the cumulative frequency for the first two classes?
5. What is the relative frequency for the first class?
6. How can the frequency distribution be represented graphically?
7. What are the benefits of using a grouped frequency distribution over a simple list of data?
8. How would outliers affect the frequency distribution?

**Tip:** When creating frequency distributions, ensure that each data point is included in only one class to avoid double counting.

Explore how to calculate the frequency for the first class (A) in statistics using interval data. This problem involves counting data points within specific intervals and determining frequency distributions.

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