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Homework Help: Stats i am stuck !

  1. Oct 20, 2006 #1
    Suppose x is a discrete, binomial random variable

    Calculate P(x > 2), given trails n = 8, success probability p = 0.3

    and

    given trails n = 6, success probability p = 0.1
     
  2. jcsd
  3. Oct 20, 2006 #2
    When it says n is more than 2, it means that x = 3, 4, and so on until 8. You can compute the probabilities for each of the values of x wanted, or you can find the answer by applying the formula and using the statistical tables.
     
  4. Oct 23, 2006 #3

    HallsofIvy

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    First, it "trials", not "trails"! P(x= m)= 8Cm(0.3)m(0.7)8-m. Since "x> 2" means x= 3, 4, 5, 6, 7, or 8, it might be simpler to find find P(x<= 2)= P(x= 0)+ P(x=1)+ P(x= 2) and then subtract from 1.
     
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