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Math Help - frequency data and standard deviation

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    frequency data and standard deviation

    Hi;
    I need some help inputting two or more seperate data lists with frequencies into
    a ti-83,I know how to put the data into lists but I din't know how to combine them.

    what I've got L1(data) L2(frequencies) L3(data) L4(frequencies)

    Now how do I combine this to get the total standard deviation

    Thank you.
    Last edited by anthonye; January 25th 2013 at 03:14 AM.
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