20000 prove that the standard deviation of the

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Unformatted text preview: 00 with a standard deviation of σ=$20,000. Furthermore, 20% of the forms have a gross income over $50,000. A group of 900 forms is chosen at random for audit. 20000 Prove, that the standard deviation of the average gross income is . Show work. 900 ⎛ X + X 2 + ... + X n ⎞ Var( X ) = Var⎜ 1 ⎟ ⎝ ⎠ n 1...
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This document was uploaded on 02/03/2014.

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