This Is the degree to which a group of data varies from their average values.
TYPES OF MEASURES OF DISPERSION:
THE RANGE
Is the difference between the highest and lowest number In a given distribution. For Instance, given the following data: 5,7,4,9,10,6,8 find the range of the above distribution. Now, to get the range, we take the highest number, which is .10 and then minus it from the lowest number, which is 4. Therefore, the range of the distribution is 6, i.e. 10-4 = 6. Or we can simply write the lowest number and the highest number instead of finding the difference. i.e. 4-10.
VARIANCE:
This is the squared deviation of a given set of numbers from their arithmetic mean. It measures the extent to which numerical datas are spread about from their average. The formula is
S2 = (x- x)2 N