document.write( "Question 1190748: The mean of a set of numbers is 500.
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Algebra.Com's Answer #822498 by math_helper(2461) $\"\"$ $\"About$

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document.write( "+...+ / n = 500    (1)\r
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document.write( "(a)
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document.write( "Adding 10 to each term gives\r
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document.write( "+...+ / n 
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document.write( "Notice we've add 'n' 10's:
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document.write( "= ( +...+ ) / n\r
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document.write( "Writing it slightly different:
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document.write( "= (  ) + (+...+ ) / n \r
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document.write( "The second paren's is just 500  (from (1))
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document.write( "=    10 + 500  = \r
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document.write( "(b)
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document.write( "Multiplying each term by  k  results in a new mean that is  k*(original_mean)\r
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document.write( "So the new mean if you multiply by -5   is   -5 * 500 = \r
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