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Probability Question

  1. Jun 12, 2005 #1
    Any possible solutions to the following probability puzzler? Cheers

    A site with a rotating workforce provides emergency response training for some regular members of staff. In an emergency they are called into the emergency team. On the site 20% have emergency training. I want to find 3 emergency trained staff, and the contact list is out of date. What is the probability of getting 3 emergency trained staff after 3 phone calls. What is the probability of getting 2 after 3 calls?
  2. jcsd
  3. Jun 13, 2005 #2


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    Gold Member

    You don't even know it there are 3 emergency-trained staff. What if there's only 5 staff total? How many people are there at one time? How many of them are emergency-trained?
    You said only the emergency-trained go on a call, so the question doesn't really make sense. Or do you just mean you're calling the place and want to know if the person who answers the phone is emergency-trained?
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