1. The problem asks: How many people are there in all based on the dot plot data? 2. The dot plot shows the number of people for each whales spotted count: - 0 whales spotted: 3 people - 1 whale spotted: 7 people - 2 whales spotted: 3 people - 3 whales spotted: 5 people 3. To find the total number of people, we add all these counts together: $$\text{Total people} = 3 + 7 + 3 + 5$$ 4. Calculate the sum: $$3 + 7 = 10$$ $$10 + 3 = 13$$ $$13 + 5 = 18$$ 5. Therefore, the total number of people is: $$\boxed{18}$$ This means there are 18 people in all who participated in whale watching.