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Math Help - Simple Z score Q - need double check

  1. #1
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    Exclamation Simple Z score Q - need double check

    Can someone help me calculate this probability using the table.

    P(-1.62 < z < 2.81)


    I got the answer as 0.0501 . My prof disagrees and says the answer is .9449. can someone explain this to me and how to go about it?

    Thanks

    Darren
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  2. #2
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    Quote Originally Posted by darren_a1 View Post
    Can someone help me calculate this probability using the table.

    P(-1.62 < z < 2.81)


    I got the answer as 0.0501 . My prof disagrees and says the answer is .9449. can someone explain this to me and how to go about it?

    Thanks

    Darren
    Pr(z < 2.81) - Pr(z < -1.62) = Pr(z < 2.81) - Pr(z > 1.62) = Pr(z < 2.81) - (1 - Pr(z < 1.62) = Pr(z < 2.81) + Pr(z < 1.62) - 1 = .......
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