I believe this “ratio” strongly depends on the nature of the position the individual(s) will be applying to. I’ve met many coworkers of mine that have highly technical roles that have surprisingly weak interpersonal skills. I have noticed that roles, such as product managers and sales engineers, that require very strong interpersonal skills, still require a great amount of technical knowledge in order to be effective in their duties. Therefore, I agree with your statement claiming the ratio for importance of technical vs interpersonal skills should be more focused towards technical skills when it comes to the biomedical engineering field. But as I had mentioned, the nature of the role ultimately dictates how important each of the two are.