Final answer:
The best approximation for the proportion of left-handed people is around 10% according to relative frequency statistics.
Step-by-step explanation:
The proportion of people who are left-handed can be approximated by looking at different relative frequency statistics. After considering several statistical sources, it has been commonly found that about 10% of the population is left-handed. This percentage serves as a general estimate since the exact proportion can vary slightly from one region to another.