Final answer:
The exact value of P(having the trait and blue eyes) if eye color and trait status were independent cannot be determined from the provided options without specific probabilities for having blue eyes and the trait independently.
Step-by-step explanation:
The value you would expect for P(having the trait and blue eyes) if eye color and trait status were independent can be calculated using the multiplication rule of probability. However, with the provided information, we do not have explicit probabilities for the trait of interest being associated with blue eyes. Generally, if two events are independent, the probability of both occurring is the product of their individual probabilities.
For instance, if the probability of having the trait (regardless of eye color) is 50% and the probability of having blue eyes is also 50%, the combined probability would be 0.5 x 0.5 = 0.25 or 25%. This is not one of the options provided (A) 84, (B) 60, (C) 50, (D) 30, which indicates a need for more specific information to accurately answer the question. Without the specific probabilities or any additional information, we cannot definitively say which value is correct.