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Home > CCG > Chapter 6 > Lesson 6.1.3 > Problem 6-28


There are students enrolled in geometry at West Valley High School.  are freshman, and are sophomores.  

  1. If a random geometry student is chosen, what is the chance (in percent) the student is a freshman or sophomore? Show how you can use the Addition Rule to answer this question. What was unusual about using the Addition Rule to answer this question?

    Addition Rule: 

    The unusual part is that the probability of and (the overlap) was .

  2. of the geometry students perform in band and perform in chorus. There is a chance that a geometry student performs in either band or chorus. What is the probability a geometry student performs both in band and in chorus?

    Use the Addition Rule again but this time you will need to solve the equation.