Its standard deviation depicts the bell curve's relative width around the mean. Bell curves (normal distributions) are used commonly in statistics, including in analyzing economic and financial data.

If the total area under the bell curve adds up to 100%, then 68% of it lies between -1 and +1 standard deviation (SD), 95% between -2 and +2 SD, and 99.7% between -3 and +3 SD.

All processes have a distribution curve that follows the arcing line of a standard bell curve: it starts off low on one end, reaches a high point in the middle, and then ends in another low point.

How to Make a Curved Chart for Standard Deviation in Excel. ... With this data you can then create a curved chart, known as a bell curve. Data, Average and Standard Deviation.

The bell curve is a grading method that evaluates students’ academic performance in comparison to other students in the course, ... He added that he feels this standard is not equitable.