Probability and Statistics(5/35) Concept The mean or expected value of a random variable is defined using the probability density (mass)function.It provides a measure of central tendency of the distribution. u=EX]=∫xfx)dx We see from the definition that the expected value is a sum of all possible values of the random variable where each one is weighted by the probability that x will take on that value. 日濟大学 AW TONGJI UNIVERSITY ➢ The mean or expected value of a random variable is defined using the probability density (mass) function. It provides a measure of central tendency of the distribution. We see from the definition that the expected value is a sum of all possible values of the random variable where each one is weighted by the probability that X will take on that value. Probability and Statistics(5/35) Concept