document.write( "Question 101227: The Tyler family had heating bills of $105,$110,$90, and $67 in the first 4 months of 2003. the bills for the same months in 2004 wre $110,$95,$75, and $76. in which year was the mean monthly bill higher and by how much? \n" ); document.write( "
Algebra.Com's Answer #73741 by doukungfoo(195)\"\" \"About 
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When asked to find the mean of a group of numbers we are being asked to find the average of that group. To find the average add them all together and divide by how many there are.
\n" ); document.write( "So for year 2003 we are given four heating bills. Lets add them together.
\n" ); document.write( "105 + 110 + 90 + 67 = 372
\n" ); document.write( "now divide 372 by 4
\n" ); document.write( "372/4 = 93
\n" ); document.write( "$93 is the mean for year 2003\r
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\n" ); document.write( "\n" ); document.write( "Now lets find the mean for year 2004
\n" ); document.write( "again first add them all together
\n" ); document.write( "110 + 95 + 75 + 76 = 356
\n" ); document.write( "and then divide by 4
\n" ); document.write( "356/4 = 89
\n" ); document.write( "$89 is the mean for year 2004\r
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\n" ); document.write( "\n" ); document.write( "In which year was the mean monthly bill higher and by how much?
\n" ); document.write( "year 2003 had the higher mean monthly bill by $4
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