# Density probability of a normal distribution at a point in a CASIO calculator

#### PCouper

##### New Member
I do not understand the utility of calculating the density probability in a point in the case of a continuous variable (for example in the case of the normal distribution). Some CASIO calculator include a function ("normal P. D.") which calculate the value of the density function of normal at a point. What is the usefulness of this calculation? Why these calculators include this function? Thanks.

#### hlsmith

##### Omega Contributor
At a point like, continuous age distribution and an age of 21years, what is the probability of an age of 21 years in sample, or do you mean probability of an age of 21 years or younger in a sample.

I can see the usefulness of both.