document.write( "Question 924752: Use the test scores below.
\n" ); document.write( "5. 81 70 73 89 68 79 91 59 77 73 80 75 88 65 82 94 77 67 82
\n" ); document.write( "c. What is a histogram of the data that uses intervals of 20? \n" ); document.write( "

Algebra.Com's Answer #561072 by Edwin McCravy(20056) $\"\"$ $\"About$

You can put this solution on YOUR website!

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document.write( " round up to 2. So the histogram will only have\r\n" );
document.write( "two bars.  \r\n" );
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document.write( "We start at the bottom, the \"x-axis\" and build up.\r\n" );
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document.write( "The first bar will start at 0.5 less than the lowest value,\r\n" );
document.write( "59-0.5=58.5.  \r\n" );
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document.write( "We add 20, getting 78.5, and mark that at the end of\r\n" );
document.write( "the first bar, which will also be the beginning of the second bar.\r\n" );
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document.write( "Then we add 20 to 78.5, getting 98.5. Since we have only two bars,\r\n" );
document.write( "that's the end of the histogram's horizontal axis. \r\n" );
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document.write( "Now we start stacking the numbers up into into which of the two \r\n" );
document.write( "categories they belong in.  \r\n" );
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document.write( "We start by stacking the first number in the list, 81, in the bar \r\n" );
document.write( "on the right because it's between 78.5 and 98.5.  Then we stack the \r\n" );
document.write( "next number 70 on the left bar. Then 73 goes on top of the 70 \r\n" );
document.write( "because it's between 58.5 and 78.5, then 89 goes on the right bar \r\n" );
document.write( "on top of the 81 because its between 78.5 and 98.5, and so on and \r\n" );
document.write( "so forth.  We end up with this:\r\n" );
document.write( "   ____\r\n" );
document.write( "  | 67 |____ \r\n" );
document.write( "  | 77 | 82 |\r\n" );
document.write( "  | 65 | 94 |\r\n" );
document.write( "  | 75 | 82 |  \r\n" );
document.write( "  | 73 | 88 |\r\n" );
document.write( "  | 77 | 80 | \r\n" );
document.write( "  | 59 | 91 |\r\n" );
document.write( "  | 68 | 79 |\r\n" );
document.write( "  | 73 | 89 |\r\n" );
document.write( "  | 70 | 81 |    \r\n" );
document.write( "  -----------\r\n" );
document.write( "58.5  78.5 98.5\r\n" );
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document.write( "Then we erase all the numbers we-ve stacked up\r\n" );
document.write( "and just leave the bars:\r\n" );
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document.write( "   ____\r\n" );
document.write( "  |    |____ \r\n" );
document.write( "  |    |    |\r\n" );
document.write( "  |    |    |\r\n" );
document.write( "  |    |    |  \r\n" );
document.write( "  |    |    |\r\n" );
document.write( "  |    |    | \r\n" );
document.write( "  |    |    |\r\n" );
document.write( "  |    |    |\r\n" );
document.write( "  |    |    |\r\n" );
document.write( "  |    |    |    \r\n" );
document.write( "  -----------\r\n" );
document.write( "58.5  78.5 98.5\r\n" );
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document.write( "Or you teacher might not care if you leave the\r\n" );
document.write( "numbers in there.  But you were probably told\r\n" );
document.write( "just to count the number of numbers that go in\r\n" );
document.write( "each bar and make the bars that high and not \r\n" );
document.write( "stack the numbers up.  But I think it's easier\r\n" );
document.write( "to stack the numbers up.  You end up with the\r\n" );
document.write( "same histogram either way.\r\n" );
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document.write( "Edwin

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