document.write( "Question 634459: Find the arithmetic mean an of an-1 = 3.9, an+1 = 7.1 \n" ); document.write( "
Algebra.Com's Answer #399613 by jim_thompson5910(35256)\"\" \"About 
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((an-1) + (an+1))/2\r
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\n" ); document.write( "\n" ); document.write( "(3.9+7.1)/2\r
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\n" ); document.write( "\n" ); document.write( "5.5
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