Final answer:
To estimate the value of n, create a proportion based on the information given. Solve for n to find that n = 135.
Step-by-step explanation:
To estimate the value of n, we can create a proportion based on the information given. We know that 54 out of n adults are over 30 years of age, and 8 out of 20 adults chosen at random are over 30 years of age.
We can set up the proportion: 54/n = 8/20. Cross-multiplying gives us 8n = 54 * 20. Solving for n, we find that n = 135.
Therefore, the estimate for the value of n is 135.