Hi Lisatindall,
I would compute the mean of the given dataset as-is. Let's call this value you x.
Next, I would compute the mean of the dataset without the -6, and call this value y.
Next, I would compute the mean of the dataset without the 14, and call this value z.
Once you have all the values, you can compare the difference:
x-y=?
x-z=?
This should answer your question.
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