Sоniа is а 24-yeаr-оld female treated fоr PTSD. She has been doing very well and comes in for a counseling session. During her visit, Sonia shows you a 0.5cm "spot" she found on her forearm. A friend at work told Sonia it was an "atypical mole" and Sonia asked how common that is. You respond that atypical moles affect ____% of the adult population.