Final answer:
Approximately 32% of the population has an IQ score below 100.
Step-by-step explanation:
According to the information provided, we can determine the percentage of the population that has an IQ below 100.
The bell curve of IQ scores shows that approximately 68% of the population falls within one standard deviation above and below the mean IQ score of 100.
Since the majority of people have IQ scores between 85 and 115, we can estimate that about 16% of the population would have an IQ below 85 and another 16% would have an IQ above 115. Therefore, approximately 32% of the population has an IQ score below 100.