Figuring percentages is determining how many of something is per 100. For example, 50 percent is the same as 50 per 100. More » Math Statistics

To find the percentage, divide the part by the whole and multiply the result by 100. A percentage represents a portion of a whole. The portion over the whole is a fraction that can then be converted into a percentage. More » Math Fractions & Percentages

The formula for finding percentages is to divide part of the whole quantity by the whole quantity and then multiply by 100 percent. A percentage change can be found by simply dividing the old quantity into the difference... More »

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 ... More »

Chi-square is a statistical test that detects whether an observed set of sample results are obtained by mere chance, or whether something other than chance is causing the data to vary. If the observed results sufficientl... More »

Probability, or the mathematical chance that something might happen, is used in numerous day-to-day applications, including in weather forecasts. For example, a weather forecast that predicts a 75 percent chance of snow ... More »

Because different assignments require different amounts of effort and are valued differently, it is important for teachers to give larger assignments more weight in the grade book. To calculate weighted grades, teachers ... More »