### Home > GC > Chapter 4 > Lesson 4.2.1 > Problem 4-54

If her class has

students, how many boys are in Ms. Shreve’s class? If there are

boys in her class, how many girls are in her class? What is the probability that she will select a girl?

The probability of selecting either a boy or a girl should add up to

. Assume that Ms. Shreve’s class has a total of

students. She selected one student (who was a boy) to attend a field trip and then was told she needed to select one more student to attend. What is the probability that the second randomly selected student will also be a boy? Since

, there are boys to start out with. However, after boy is selected, the probability of picking a boy again becomes .