To answer the first question, "Can a person be biased without an opinion?" it appears that bias and opinion are closely linked. Bias is typically defined as a personal inclination or prejudice that interferes with objective analysis. In this sense, having a bias implies having a certain opinion or preconceived notion about a particular matter. Therefore, it seems unlikely that a person can be biased without having some form of opinion.
For the second question, "Can a person have an opinion and not be biased?" it depends on how one defines bias. If bias is considered to be a deviation from objective analysis or a prejudice that interferes with fair judgment, then it might be challenging for a person to have an opinion without some degree of bias. Since every person sees the world from their own perspective and thinks their own thoughts, it can be difficult to completely separate personal biases from one's opinions.
However, it is important to note that bias can also be defined more broadly as an inclination of temperament or outlook, which may not necessarily interfere with objective analysis. In this sense, it is possible for a person to have an opinion without being biased, as long as their judgment is not unreasoned and they consider different perspectives and evidence before forming their opinion.
Ultimately, it is difficult for any human to be completely unbiased due to the inherent subjectivity in human perception and cognition. Nonetheless, individuals can strive to minimize their biases by actively seeking diverse perspectives, being open to new information, and critically evaluating their own thoughts and beliefs.