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Math Help - Probability question

  1. #1
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    Probability question

    A biased spinner has the following scores written on it 1, 2, 3 and 4. Such that the probability that the score is 1 is 0.3 and the prob that the score is 2 is 0.6.

    Ben spins the pointer once

    1) what is the prob he scores 1 or 2?
    Is it 0.3 + 0.6 = 0.9

    2) he scores 3 or 4?
    Is it 1 - 0.9 = 0.1

    Rachel spins the pointer twice

    3) What is the prob the score is 1 both time?
    Is it 0.3 x 0.3 = 0.09

    4) What is the prob the score is 2 exactly once?
    NOT SURE HOW TO DO THIS ONE
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  2. #2
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    For #4 calculate two times the probability of (\text{a two and not a two)} in that order.
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  3. #3
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    Would it be (0.6 x 0.4) + (0.6 x 0.4) = 0.24 + 0.24 = 0.48
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  4. #4
    MHF Contributor Unknown008's Avatar
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    Yes for all three.

    For the other one, it is the probability that she gets a 2 on the first throw and another number on the second throw, OR, she scores another nubmer on the first throw and scores 2 on the second throw.

    Try it out!

    EDIT: Well... Natasha gave it away...
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