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Could somebody help me with this formula by telling me what exactly the n stands for and the X?? In addition, please tell me how

Could somebody help me with this formula by telling me what exactly the n stands for and the X??

In addition, please tell me how I can type this formula in the TI-30x pro Mathprint calculator.

Sample Variance and Standard Deviation n E (x -X)2 n Variance S2 = i=1 . (X; - X)2 n-1 n-1 1=1 standard deviation s = VS2

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