Measures Of Central Tendency

Mean

Mean, also called arithmetic average or arithmetic mean, is found by dividing the sum of all observations by the total number of observations. For raw

Median is the middle observation after

Median is the middle observation after the data is arranged in ascending or descending order. If n is odd, the median is the ((n + 1) / 2)th observati

Mode is the observation that occurs

Mode is the observation that occurs most frequently, or the value with maximum frequency. If all values occur equally often, there is no mode. If two

Class mark is the midpoint

Class mark is the midpoint of a class interval. It is calculated by the formula x_i = (Lower class limit + Upper class limit) / 2.

An assumed mean a is chosen

An assumed mean a is chosen to simplify calculations. Deviations are found by d_i = x_i - a, and the mean is calculated by x̄ = a + (Σfi di) / N.