l Chapter 7-Key concept The area under a probability density function between two bounds, a and b, is the probability that a value will occur within the bounded interval between a and b o 2002 The Wadsworth GroupChapter 7 - Key Concept •The area under a probability density function between two bounds, a and b, is the probability that a value will occur within the bounded interval between a and b. © 2002 The Wadsworth Group