Statistics Mind Map
Use this learning tree to open the right concept in the right order. Start with a branch, expand it, then move into the concept page you need next.
Mean of grouped data
highThe mean of grouped data is the average value found by using class marks and frequencies of the grouped table.
Always write the class mark first, then multiply by frequency, and keep the total frequency in the denominator.
Assumed mean method
highThe assumed mean method is a shortcut for finding the mean of grouped data by taking one convenient central value as a reference.
Choose a class mark near the center of the data to keep deviations small and calculations simple.
Step deviation method
highThe step deviation method is a fast way to find the mean of grouped data when class widths are equal.
Check the class width first. If all intervals are equal, step deviation can save time in the board exam.
Help improve this page
Found something confusing, incorrect, or missing?