1. **State the problem:** We are asked to calculate the number of left-handed people in Wales in 2011 given the population and percentages. 2. **Identify given data:** - Population of Wales in 2011: $3063000$ - Percentage of world population that is left-handed: $12\%$ 3. **Assumptions made:** - The % of left-handed people in Wales is the same as the world average ($12\%$). - The population data given is accurate and no other demographic factors affect handedness %. 4. **Calculate the number of left-handed people:** $$\text{Number of left-handed people} = 12\% \times 3063000 = 0.12 \times 3063000$$ $$= 367560$$ 5. **Final answer:** There are approximately $367560$ left-handed people living in Wales in 2011 under the assumption that Wales has the same proportion of left-handed people as the world average.