1. **State the problem:** We are given that 20% of the people in Tamale have unlisted telephone numbers. We select 200 people at random and want to find how many are expected to have unlisted numbers. 2. **Formula used:** The expected number of people with unlisted numbers is given by $$\text{Expected} = \text{Total people selected} \times \text{Probability of unlisted number}$$ 3. **Apply the values:** Here, total people selected = 200 and probability of unlisted number = 20% = 0.20. 4. **Calculate:** $$\text{Expected} = 200 \times 0.20$$ 5. **Simplify:** $$\text{Expected} = 40$$ 6. **Interpretation:** So, out of 200 people selected, we expect 40 to have unlisted telephone numbers on average.