Final answer:
In modern societies, biases exist in a significant portion of the population, encompassing various aspects like religion, disease rates, trust in government, political ideologies, and sexual orientation.
Step-by-step explanation:
In modern societies, it is difficult to determine an exact percentage of humans who have biases. However, based on the provided information, we can see that various aspects of society, such as religion, disease rates, trust in government, political ideologies, and sexual orientation, all show different percentages of bias or differences in opinions and beliefs. For example, the estimated percentages for religious affiliation range from 5.5% to 33%, while political ideology differences among US teenagers account for about one-third of the population. Therefore, it is safe to say that biases exist in a significant portion of the population, and it is plausible to infer that the percentage lies between the given range of 3% to 5%, likely closer to the higher end.