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When Ms. Shreve randomly selects a student in her class, she has a probability of selecting a boy.  

  1. If her class has students, how many boys are in Ms. Shreve’s class?

  2. If there are boys in her class, how many girls are in her class?

  3. What is the probability that she will select a girl?

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

  4. 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 .