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

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.