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Math Help - basic stats 3

  1. #1
    Junior Member
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    basic stats 3

    1. The # of tow calls coming into an tow truck station on Tuesday (between 7:00 - 8:00 AM) has a probability dist. With a mean of four.
    i) State what type of prob. Dist. would be appropriate for this.
    ii) Find the prob. of not getting any emergency tow calls between 7-8 a.m.
    iii) Find the prob. of receiving 5 emergency tow calls between 7-8 a.m.
    iv) List what is the # of emergency tow calls expected to be received.
    v) List what is the std. dev. of emergency tow calls received.
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  2. #2
    Super Member
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    Just a bunch of questions. At this level of stats - theres only one distribution that has as its parameter the mean of a population. Knowing which distribution that is should help you do the rest of the problems.
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  3. #3
    Junior Member
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    May 2009
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    So is this Poisson then?
    Next queston is:
    I was gone for an entire week and missed how to do these problems.
    I have a TI-89 calculator (titanium model). How do you set up the first problem?
    Example:
    For the first one I coem up with u=4;P(x<=0)= ... but not sure how to enter this in my calc.

    Please advise.
    Thanks!
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