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Math Help - mean and standard deviation help please!

  1. #1
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    mean and standard deviation help please!

    I have a question here that I cannot figure out (actually a few). I am not to good at this, and need some one to help me out. If you can help on this one maybe I can figure out the rest.

    The weight of potato chip bags filled by a machine at a packing plant is normally distributed with a mean of 15.0 ounces and a standard deviation of 0.2 ounces. What is the probability that a randomly chosen bag will weigh more than 15.6 ounces?
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    Quote Originally Posted by mercury228 View Post
    I have a question here that I cannot figure out (actually a few). I am not to good at this, and need some one to help me out. If you can help on this one maybe I can figure out the rest.

    The weight of potato chip bags filled by a machine at a packing plant is normally distributed with a mean of 15.0 ounces and a standard deviation of 0.2 ounces. What is the probability that a randomly chosen bag will weigh more than 15.6 ounces?
    \Pr(X > 15.6) = \Pr\left(Z > \frac{15.6 - 15.0}{0.2}\right) = \Pr(Z > 3) = 1 - \Pr(Z < 3).

    Use your Standard Normal Distribution Tables to finish the calculation.
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