document.write( "Question 1189155: The table shows the petrol sales in one day by a number of city service stations.\r
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\n" ); document.write( " Amount of petrol (P L) Frequency
\n" ); document.write( "2000 to 3000 4
\n" ); document.write( "3000 to 4000 4
\n" ); document.write( "4000 to 5000 9
\n" ); document.write( "5000 to 6000 14
\n" ); document.write( "6000 to 7000 23
\n" ); document.write( "7000 to 8000 16\r
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\n" ); document.write( "\n" ); document.write( "Estimate the total amount of petrol sold for the day by the service stations. Ans: 411 000 L or 411 kL \n" ); document.write( "

Algebra.Com's Answer #820413 by ikleyn(52800) $\"\"$ $\"About$

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document.write( "I extended the table, adding the columns with average petrol sales from each group of stations\r\n" );
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document.write( "and total sales from each of groups of stations.\r\n" );
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document.write( "         T          a          b          l          e\r\n" );
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document.write( "Amount of petrol (P L) Frequency   Average of petrol sales    Estimate of petrol sales \r\n" );
document.write( "                                   from these stations        from these stations\r\n" );
document.write( "  2000 to 3000            4              2500                      2500*4\r\n" );
document.write( "  3000 to 4000            4              3500                      3500*4\r\n" );
document.write( "  4000 to 5000            9              4500                      4500*9\r\n" );
document.write( "  5000 to 6000           14              5500                      5500*14\r\n" );
document.write( "  6000 to 7000           23              6500                      6500*23\r\n" );
document.write( "  7000 to 8000           16              7500                      7500*16\r\n" );
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document.write( "Then I calculated a gross total estimation.\r\n" );
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document.write( "Gross total estimation = 2500*4 + 3500*4 + 4500*9 + 5500*14 + 6500*23 + 7500*16 = 411000 L = 411 kL.    ANSWER\r\n" );
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