1. **State the problem:** We need to find the probability that an animal chosen at random from tank B is either a lobster or a ray. 2. **Identify the quantities:** From the bar chart description for tank B: - Lobsters: 15 - Rays: 15 - Starfish: 30 3. **Calculate total animals in tank B:** $$15 + 15 + 30 = 60$$ 4. **Calculate favorable outcomes (lobster or ray):** $$15 + 15 = 30$$ 5. **Calculate the probability:** $$\text{Probability} = \frac{\text{Number of lobsters or rays}}{\text{Total number of animals}} = \frac{30}{60}$$ 6. **Simplify the fraction:** $$\frac{30}{60} = \frac{1}{2}$$ **Final answer:** The probability that an animal chosen from tank B is either a lobster or a ray is $\frac{1}{2}$.