Use the following definition of the arithmetic mean x of a set of n measurements x1, x2,

Use the following definition of the arithmetic mean xÌ… of a set of n measurements x1, x2, x3, . . . , xn.

1. Find the arithmetic mean of the six checking account balances $327.15, $785.69, $433.04, $265.38, $604.12, and $590.30. Use the statistical capabilities of a graphing utility to verify your result.
2. Prove that

3. Prove that

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п х - п =D1 (x; - x) = 0- i=1