Statistics definition

Statistics is used for measures of dispersion and the following are the methods

  1. Range
  2. Quartile Deviation
  3. Mean Deviation
  4. Standard deviation

Range: the difference between lowest and highest values is called Range.

  • Example: in 3,7,9,10,12,9
  • Lowest Value = 3
  • And highest value = 12
  • So range = 12-3 = 9

Standard deviation

Formula of Standard deviation

formula-of-standard

Example: how to calculate Standard deviation of the following problems

50,60,80,90,120

Step -1

First we calculate the mean

step1

Step-2

table

tablebelow

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