Let's go through the questions one by one from the image you provided. The exercise seems to focus on statistics, specifically dealing with mean (rata-rata), median, and mode (modus).

Question 1:

You are asked to determine the mean, median, and mode for several data sets:

• a. $8, 19, 12, 16, 18, 20, 19$
• b. $10, 12, 17, 14, 4, 14, 6, 8, 9$
• c. $6, 9, 2, 5, 3, 12, 14$
• d. Calculate the mean for age group data for Iwan and others (this requires more specific info about the ages).

Would you like me to solve all parts of Question 1 in detail now?

Let me know which question you'd prefer to start with!