Tag: statistics

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Statistics

Topic Tree

  1. Mean
  2. Mode
  3. Median
  4. Graphical interpretation

MEAN

Mean for ungrouped data

Mean for grouped data

  1. Direct method
  2. Assumed mean method
  3. Step-deviation method

Direct method

Mean is given by the following formula by direct method

Assumed mean method

Mean by assumed mean method is given by the formula

where a = assumed mean
di = xi -a

Step deviation method

Means is given by step deviation method as

h = class size

MODE

Mode for grouped data

l = lower limit of the modal class

h = size of class interval

f1 = frequency of modal class

f0 = frequency of the preceding modal class

f2 = frequency of the succeding modal class

Modal class = class corresponding to the maximum class frequency.