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    Statistics - Probability

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    Fred's Surfboard Shop makes surfboards by hand. The number of surfboards that Fred makes during a week depends on the wave conditions. Fred has estimated the following probabilities for surfboard production for the next week.
    Number of Surfboards 5 6 7 8 9 10
    Probability 0.13 0.22 0.3 0.1 0.15 0.1
    Let event A be that Fred produces more than six surfboards. Let event B be that Fred produces less than eight surfboards. Which of the following statements is true?

    a. P(A and B) = 0

    b. P(A) = P(B)

    c. P(A or B) = P(A) + P(B)

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