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Math Help - help with probability!! #3

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    Exclamation help with probability!! #3

    I need help with the following questions, i attempted to solve them, and i also put my answers here too.
    When you are answering them, please show all your steps as i am kinda lost in this field.

    3. Suppose your right knee is sore 15% of the time and your left knee is sore 10% of the time. What is the largest possible percentage that at least 1 knee is sore? What is the smallest possible percentage that at least 1 knee is sore?
    my answer
    Largest
    15%+10% = 25%
    Smallest
    0.15*0.10 = 0.015
    so 1.5%


    5. Suppose 55% of students are female and 45% are male.
    44% of females have long hair and 15% of males have long hair.
    What is the probability that a random student will either be female or have long hair (or both)?
    my answer
    chance of female: 55%
    chance of long hair: (55%*44%) + (45%*15%) = 0.2420 + 0.0675 = 0.3095 = 30.95%
    chance of female or long hair = 55% + 30.95% = 85.95%
    chance of female with long hair: 0.2420 = 24.2%
    Last edited by mr fantastic; September 15th 2010 at 08:41 PM. Reason: Moved.
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