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To solve the question, we need to find the **mode** (or "modus") of the distribution of events per month based on the frequency provided. The mode is the data point or class that occurs most frequently.

### Step-by-step solution:

1. **Data given:**
   - Event range: 1-3 events/month with a frequency of 5
   - Event range: 4-6 events/month with a frequency of 8
   - Event range: 7-9 events/month with a frequency of 10
   - Event range: 10-12 events/month with a frequency of 6
   - Event range: 13-15 events/month with a frequency of 1

2. **Finding the mode:**
   The mode is the event class with the highest frequency. Here, the highest frequency is 10, which corresponds to the range **7-9 events per month**.

3. **Estimating the exact mode:**
   To calculate the mode from grouped data, we use the formula:

   \[
   \text{Mode} = L + \left( \frac{f_m - f_{m-1}}{(f_m - f_{m-1}) + (f_m - f_{m+1})} \right) \times h
   \]

   Where:
   - \(L\) is the lower boundary of the modal class (7 in this case),
   - \(f_m\) is the frequency of the modal class (10),
   - \(f_{m-1}\) is the frequency of the class before the modal class (8),
   - \(f_{m+1}\) is the frequency of the class after the modal class (6),
   - \(h\) is the class width (9 - 7 = 3).

   Plugging in the values:

   \[
   \text{Mode} = 7 + \left( \frac{10 - 8}{(10 - 8) + (10 - 6)} \right) \times 3
   \]

   \[
   \text{Mode} = 7 + \left( \frac{2}{2 + 4} \right) \times 3 = 7 + \left( \frac{2}{6} \right) \times 3
   \]

   \[
   \text{Mode} = 7 + \frac{6}{6} = 7 + 1 = 8
   \]

Thus, the mode of the number of events is **8**.

The closest answer to this value from the options provided is **e. 8,0**.

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Would you like further explanation or details on this method? Here are some related questions:

1. How do you calculate the mode from ungrouped data?
2. What is the significance of the mode in statistical analysis?
3. How do you differentiate between the mode and the mean?
4. How does class width affect the calculation of the mode?
5. Can there be more than one mode in a data set?

**Tip:** In grouped data, estimating the mode gives a more accurate understanding of the central tendency than simply choosing the midpoint of the modal class.

Berikut merupakan rekapitulasi banyaknya event yang ditangani suatu event organizer selama beberapa bulan terakhir. Tentukan banyaknya event yang sering terjadi (modus) selama satu bulan.

Learn how to calculate the mode for grouped data based on event frequencies handled by an event organizer. This problem covers key statistical concepts, including finding the mode for grouped data using a step-by-step approach.

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