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Home > CCG > Chapter 11 > Lesson 11.1.3 > Problem 11-50

11-50.

A snack cracker company conducted a taste test for the three different types of crackers it makes. It surveyed people in each age group in the table below. Participants chose their favorite type of cracker. Use the results to answer the questions.  

Age

Cracker A

Cracker B

Cracker C

Under

to 

to 

and over

  1. Calculate the probability that a participant chose cracker A or was under years old. Show how you used the Addition Rule.

    If the question says 'or' you must subtract the probability of 'and'.

    %

  2. What is the probability that a participant did not choose cracker A and was over years old? Show how you used a complement to answer this problem.

    To use the complement, reverse the method you used in part (a).
    Subtract and from the total.

  3. What is the probability that a participant was years old or older. Show how you used a complement to answer this problem.

    Use the same method from part (b).

  4. A randomly-selected participant says he is years old. What is the probability that he chose cracker A?

    Each age group only has participants.

    %