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# What is a density curve?

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A density curve is used in statistics to make a rough illustration of a distribution. It is always drawn above the horizontal axis on a graph, and the area is always one.

## Keep Learning

The area below the density curve represents all observations that fall within the range of the horizontal axis. It is an idealized picture of the data, and is not perfectly accurate. If the density curve is symmetrical, then the mean and the median will be equal. If the distribution skews left, then the mean will be less than the median, and vice versa if the distribution skews right.

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## Related Questions

• A:

Temperature is not the only factor that determines when glass breaks, as the speed in which the glass is heated, as well as the distribution of heat, play a large role in determining expansion and contraction of glass which can ultimately cause shattering and cracks. Known as a thermal break, applying heat to glass can cause it to crack or shatter.

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• A:

The mean IQ score is 100 points, and results fall into a normal distribution curve with a standard deviation of 15 points. This means that 68 percent of people fall within a single deviation, or 85 to 115 points, and 95 percent score between 70 and 135.

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• A:

Bell curve percentages are various values that are used in the plotting of a density curve to represent a normal distribution in a histogram. The percentages obeyed by all bell curves are 68, 95 and 99.7. The curves are always above the axis.