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Math Help - Z problem

  1. #1
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    Z problem

    I calculated my z value to be z=(23-18)/3 = 5/3 = 1.66

    I am trying to find P(Z>1.6666) = ?

    can someone please explain how to get this probability using the Z table?

    thanks in advance

    i got 0.0485

    0.5 - 0.4515
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  2. #2
    Moo
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    Hello,
    Quote Originally Posted by ndcruz View Post
    I calculated my z value to be z=(23-18)/3 = 5/3 = 1.66

    I am trying to find P(Z>1.6666) = ?

    can someone please explain how to get this probability using the Z table?

    thanks in advance

    i got 0.0485

    0.5 - 0.4515
    Well, if this is what you got by using the Z table, then you know how to use it, because your answer is correct...

    The z table represents the area bounded by the Gaussian curve, the x axis, the y axis and the line x=a, where a is the z value of the table.

    So in fact, tables give you this probability : P(0<z<a)

    Let a>0 and b<0. Let z_a and z_b be the z scores of a and b.
    P(z<a)=0.5+z_a
    P(z>a)=0.5-z_a
    P(z>b)=0.5+z_b
    P(z<b)=0.5-z_b
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