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Math Help - Solution needed

  1. #1
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    Solution needed

    Hey there , i was following this forum for sometime now and its very helpful. Anyways i need to know the solution for the questions below. I lost lost while doing it. My lecturer gave us 80 questions to do before sitting for the pop quiz . Im halfway done , just a few barriers to get there.




    1)Seven fair coins are tossed. Find the probability of
    a) getting 6 heads
    b) getting at least 2 heads
    c) getting no head at all


    2) Five fair dice are rolled. Find the probability that
    a) exactly 3 dice show number 1
    b) exactly 2 dice show number 4
    c) at least a dice shows number 4

    I dont have the answer scheme with me , so it would really be helpful if one could guide me with the steps and final answer. Thanks in advance
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  2. #2
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    Dec 2010
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    Before we help you. Let us know your thoughts on how you think these problems should be approached.
    It is ok if you are wrong, but let us see some effort.
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  3. #3
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    Quote Originally Posted by Bass View Post
    Hey there , i was following this forum for sometime now and its very helpful. Anyways i need to know the solution for the questions below. I lost lost while doing it. My lecturer gave us 80 questions to do before sitting for the pop quiz . Im halfway done , just a few barriers to get there.




    1)Seven fair coins are tossed. Find the probability of
    a) getting 6 heads
    b) getting at least 2 heads
    c) getting no head at all


    2) Five fair dice are rolled. Find the probability that
    a) exactly 3 dice show number 1
    b) exactly 2 dice show number 4
    c) at least a dice shows number 4

    I dont have the answer scheme with me , so it would really be helpful if one could guide me with the steps and final answer. Thanks in advance
    Both questions can be done using the Binomial distribution. In each one you first need to think about the following:

    What is n? What is p?

    Now calculate the required probabilities.

    If you need more help, please show all your work and say where you get stuck.
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