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    Normal Distribution question




    Can someone help me out with this,

    Based on a population that is normally distributed, with a population mean of $470 and a population standard deviation of $59....

    1. If we randomly select ONE (1) member of this population what is the probablity that the value will be less than $450?
    2. If we randomly select a sample of FOUR (4) members of this population what is the probablity that the sample mean will be less than $450?
    3. If we randomly select a sample of FIFTY (50) members of this population what is the probablity that the sample mean will be less than $450?

    Thanks!!!

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    Re: Normal Distribution question

    Quote Originally Posted by 101stats101 View Post
    Can someone help me out with this,

    Based on a population that is normally distributed, with a population mean of $470 and a population standard deviation of $59....

    1. If we randomly select ONE (1) member of this population what is the probablity that the value will be less than $450?
    2. If we randomly select a sample of FOUR (4) members of this population what is the probablity that the sample mean will be less than $450?
    3. If we randomly select a sample of FIFTY (50) members of this population what is the probablity that the sample mean will be less than $450?

    Thanks!!!
    To begin with, are you familiar with the standard Z transformation so that you can use the tables in your textbook to determine the probabilities?

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    Re: Normal Distribution question


    z tables will help you out a lot

    look in your textbook about how to find z values and your probability calculations will be a piece of cake

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