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Math Help - Sampling distributions

  1. #1
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    Sampling distributions

    Lemmings have a mean body weight of 63.5 grams with a standard deviation of 12.2 grams. If weights are distributed normally, what is the probability that a random sample of 15 lemmings will have an average body weight of 54 grams or less?


    I'm not exactly sure what to do.
    Can I calculate this with my TI?

    Thanks .
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  2. #2
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    Distribution of a Sample Mean has what Standard Deviation?

    \frac{PopulationSD}{\sqrt{n}}?

    After that, it's just a z-score lookup.
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