Final answer:
Approximately 20.83% of the people in the world lived without clean drinking water.
Step-by-step explanation:
To find the percentage of people who lived without clean drinking water, we can divide the number of people without clean drinking water by the total population and multiply by 100. In this case, we can divide 1,000,000,000 by 4,800,000,000 and multiply by 100 to get the percentage. Let's calculate:
1,000,000,000 / 4,800,000,000 = 0.208333333330.20833333333 * 100 = 20.83%
Therefore, approximately 20.83% of the people in the world lived without clean drinking water.