The midpoint between two numbers a and b This can be generalized to k numbers between a and b, such that there is a common differnce between each consecutive number
The sum of the sample values divided by the number of items in the sample Thus, if the sample consists of five invoices with a value of $2, $5, $12, $14, and $17, the mean invoice value would be their total ($50) divided by their number(s), or $10 The mean is the central tendency of a frequency distribution
The sum of all the measurements in a data set divided by the number of measurements in the data set
The total score of all the observations added together, divided by the number of observations
the mean (or average) of sample data; it provides an unbiased estimate of the parametric mean; designated by x (NOTE: There are other kinds of means, such as harmonic, geometric, and parametric )
The value obtained by dividing the sum of a set of quantities by the number of quantities in the set. Also called average
A simple average calculated by adding up a group of values, and dividing the sum by the number of values
value The variance is calculated by taking the sum of the squares of the deviations, that is, the sum of the difference between the observed value and the series mean value, and dividing by the sample size (number of observations) The variance for a large data set (the population variance) is calculated as