Math Models

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The scores on a standardized test are normally distributed with the mean of 750 and standard deviation 70. Find the probability that a score is more than 890.
This is from my Math Models class. I am not taking Statistics. Please someone show me how to do answer this-I don't just want an answer. I want the steps!!

  • Math Models -

    this just involves using the Z table.
    890 is 140 away from the mean.
    That's 140/70 = 2σ

    So, find where Z>2. That's your probability. To play around some with this, visit

    http://davidmlane.com/hyperstat/z_table.html

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