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To find the average (mean) of the data from the given frequency table, we can follow these steps:

1. **Find the midpoint** for each interval.
2. **Multiply the midpoint by the frequency** for each interval to get the contribution of each class.
3. **Sum up all the contributions**.
4. **Divide by the total frequency** to get the mean.

Let's break it down:

### Step 1: Find the midpoints of each class
- For the interval \(2 - 6\), midpoint = \(\frac{2 + 6}{2} = 4\)
- For the interval \(7 - 11\), midpoint = \(\frac{7 + 11}{2} = 9\)
- For the interval \(12 - 16\), midpoint = \(\frac{12 + 16}{2} = 14\)
- For the interval \(17 - 21\), midpoint = \(\frac{17 + 21}{2} = 19\)
- For the interval \(22 - 26\), midpoint = \(\frac{22 + 26}{2} = 24\)

### Step 2: Multiply each midpoint by its corresponding frequency
- \( 4 \times 2 = 8\)
- \( 9 \times 3 = 27\)
- \( 14 \times 3 = 42\)
- \( 19 \times 6 = 114\)
- \( 24 \times 6 = 144\)

### Step 3: Add these products together
\[
8 + 27 + 42 + 114 + 144 = 335
\]

### Step 4: Add the total frequency
\[
2 + 3 + 3 + 6 + 6 = 20
\]

### Step 5: Divide the sum by the total frequency to find the mean
\[
\text{Mean} = \frac{335}{20} = 16.75
\]

Thus, the average (

Rata-rata dari data yang disajikan oleh tabel berikut adalah?

Learn how to calculate the mean from a frequency distribution table. This problem provides a step-by-step guide to finding midpoints, multiplying them by their frequencies, and summing up the values to determine the average. Suitable for students in Grades 9-10.

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