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I don't understand how, in AP Stats, we are supposed to get X 1 -X 2 . There is X 1 with a mean of

I don't understand how, in AP Stats, we are supposed to get X1-X2.

There is X1 with a mean of 21 and standard dev of 1.5

There is X2 with a mean of 16 and SD of 6.5

We need to know if we'd be surprised if the sample mean for X1 is greater than X2

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