what is probability density?

Question

perl · Answer

probability density curve ?

perl · Answer

It is the function whose area under its curve over the interval [a,b] is the probability that you will find X between a and b .

perl · Answer

In probability theory, a probability density function (PDF), or density of a continuous random variable, is a function that describes the relative likelihood for this random variable to take on a given value. The probability of the random variable falling within a particular range of values is given by the integral of this variable's density over that range http://en.wikipedia.org/wiki/Probability_density_function

anonymous · Answer

do you know two important properties of it? @perl

perl · Answer

yes the total area under the curve is 1

perl · Answer

and the function is always positive

perl · Answer

the function is symmetric about the y axis

anonymous · Answer

ok thank you so much @perl