1. **Stating the problem:** We are asked to find the average (mean) of the variable "Kepuasan Kerja Karyawan" (Employee Job Satisfaction) from the given data. 2. **Formula for average:** The average or mean of a set of values $x_1, x_2, ..., x_n$ is given by: $$\text{Mean} = \frac{\sum_{i=1}^n x_i}{n}$$ where $n$ is the number of data points. 3. **Extracting the data:** The values for "Kepuasan Kerja Karyawan" are: 155, 150, 175, 170, 180, 170, 155, 165, 160, 170 4. **Calculating the sum:** $$155 + 150 + 175 + 170 + 180 + 170 + 155 + 165 + 160 + 170 = 1600$$ 5. **Number of data points:** There are $n = 10$ employees. 6. **Calculating the mean:** $$\text{Mean} = \frac{1600}{10} = 160$$ 7. **Interpretation:** The average job satisfaction score among the employees is 160. This completes the answer to part (a) of the problem. Note: Parts (b), (c), and (d) require statistical analysis using SPSS or similar software and are not solved here as per instructions to answer only the first question.