Looking through chapter 6 on Bayesian Classifiers. I do not think it is correct from page 52. He appears to be using the p.d.f of the standard normal distribu

Looking through chapter 6 on Bayesian Classifiers. I do not think it is correct from page 52. He appears to be using the p.d.f of the standard normal distribution for point estimators. I have training in classical/frequentist stats, so correct me if I'm wrong, but probability estimates from a pdf are given by the area under the curve, the value at a point is meaningless. In fact the probability at a given point is always zero.