I am not totally convinced that is the exact problem. It reads weird. Also, you have not provided any context. Is it from a linear regression or say a causal inference course? What textbook are you using? What does the problem before and after this one look like?
If bias (B) in terms of σ is 1.5 (i.e B/σ=1.5) find the total error.
sigma = 1.5
?/1.5 = 1.5, so bias equals 1 per algebra. Until more information is provided, that is the best I can do.