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With a known population mean of 100, and a known standard error of the mean of 7.5, what is the probability of selecting at random a sample whose mean is 110 or greater?

I need help getting this started, thanks

  • Statistics - ,

    Finding z-score with your data:

    z = (110 - 100)/(7.5)

    Finish the calculation. Check a z-table for your probability using the z-score (remember the question is asking "whose mean is 110 or greater" when looking at the table).

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