Class-widths and Mid-ages

Class-widths and Mid-ages

Understanding Class Widths

• In statistics, class width refers to the difference between the upper and lower boundaries of any class (or group) in a frequency distribution.
• This is one way to organise and analyse a large set of data, making it easier to understand the data distribution.
• To calculate class width, subtract the lowest (lower limit) from the highest number (upper limit) in each class and add one to your result.

Understanding Midpoints

• Class midpoint or class mark is the central value of a data class. It is used as a representative or central location of the data class.
• The class midpoint is calculated by summing the lower and upper limits of the class and dividing by 2.

Calculation and Usage

• Consider a data class with a range of 10–20. The class width would be 11 (20-10+1) and the class midpoint would be 15 ((10+20)/2 = 15).
• The class width tells you the range of data contained in each class while the class midpoint gives you a single value to represent all data in that class in analysis.
• The class width and