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Math Help - standard normal distribution

  1. #1
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    standard normal distribution

    Hi, I'm having a very hard time trying to solve this, please help me. I need to find the indicated probability using the standard normal distribution. the problem is this P(-196 <z <1.96) Could you help me with the steps on how to solve this. Thank you in advance.
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  2. #2
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    Quote Originally Posted by mkcar View Post
    Hi, I'm having a very hard time trying to solve this, please help me. I need to find the indicated probability using the standard normal distribution. the problem is this P(-196 <z <1.96) Could you help me with the steps on how to solve this. Thank you in advance.
    You should have a table of the cumulative standard normal distribution.

    This should tell you P(z<Z), so look up the table for Z=1.96, then:

    P(-1.96<z<1.96) = 1-2[1-P(z<1.96)],

    but you should have this particular case memorised, without looking I can
    tell you that it is 0.95.

    RonL
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