Measure of central Tendency

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1. Mean:
The arithmetic mean is what is commonly called the average: when the word mean is used without a modifier, it can be assumed that it refers to the arithmetic mean. The mean is the sum of all the scores divided by the number of scores. The formula in summation notation is:

Eg:
The average number of patients visiting the clinic everyday can be found by using the above formula. Let the total number of patients visiting the clinic is 3650 for a year. The average number of patients visiting the clinic per day is given by,

So the average number of patients visiting the clinic is 10 per day.

Median:
The median is the middle of a distribution: half the scores are above the median and half are below the median. The median is less sensitive to extreme scores than the mean and this makes it a ...