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Math Help - Probability Models

  1. #1
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    Probability Models

    Hello all, I missed a few days in my statistics class, and I need help with some homework, the question is as follows:

    Information:

    According to the current population survey, the following table summarizes probabilities for randomly selecting a full-time student in various age groups:

    Age 15-17 18-24 25-34 35 or older
    Probability 0.007 0.573 0.260 0.160

    Question: If we randomly select a full time student, what is the probability that he/she is 25 or older?

    Second question: If we randomly select a full time student, what is the probability that he/she is NOT 18-24 years old?


    I would appreciate solutions, and/or the steps that must be taken to find them.

    regards,
    -andrew
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  2. #2
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    Re: Probability Models

    Quote Originally Posted by arrogantandy View Post
    Hello all, I missed a few days in my statistics class, and I need help with some homework, the question is as follows:
    Information: According to the current population survey, the following table summarizes probabilities for randomly selecting a full-time student in various age groups:
    Age 15-17 18-24 25-34 35 or older
    Probability 0.007 0.573 0.260 0.160

    Question: If we randomly select a full time student, what is the probability that he/she is 25 or older?
    Second question: If we randomly select a full time student, what is the probability that he/she is NOT 18-24 years old?
    I would appreciate solutions, and/or the steps that must be taken to find them.
    This is not a tutorial service. Therefore, do not ask for a step-by-step solution. You can pay a tutor for that. We are free.

    Now you need to show some effort,

    For a) there are two numbers to add for at least 25. What is the sum?
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