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Sarah
Sarah asked in Science & MathematicsMathematics · 5 years ago

Probability?

A trial consists of flipping a fair coin. A success occurs when the coin lands heads. A failure occurs when the coin lands tails. The coin is flipped three times.

. a)  What is the probability of a success on the third flip?

. b)  What is the probability of successes on the first two flips?

. c)  What is the probability that there will be exactly two successes in the experiment?

4 Answers

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  • Richard
    Lv 7
    5 years ago
    Favorite Answer

    a) 1/2 or 0.5

    b) 1/2 * 1/2 = 1/4 or 0.25

    c) There are 8 result sequences from performing 3 flips. There are 3 ways that just one flip can fail.

    = 3/8 or 0.375

    I hope this helps.

  • ?
    Lv 7
    5 years ago

    A) 1/3 B) 2/3 C) 1/3

  • david
    Lv 7
    5 years ago

    a. 1/2 ... trials are independent

    b. (1/2)(1/2) = 1/4

    c. C (3,2) = 3

    3 (1/2)^2(1/2) = 3/8 <<< answer

  • alex
    Lv 7
    5 years ago

    a/

    1/8

    b/

    1/8

    c/

    3/8

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