STATISTICS

Collection of Data

1.Primary Data

2. Secondary Data

Arithmetic Mean

Arithmetic mean is defined as

Arithmetic Mean-Grouped Frequency Distribution

In grouped frequency distribution, arithmetic mean may be computed by applying any one of the following methods.

(i) Direct Method

(ii) Assumed Mean Method

(iii) Step Deviation Method

Direct Method

Steps involved in direct method are represented below

Assumed Mean Method

Steps involved in Assumed Mean method are represented below

Median

It is the number in the ‘middle’, pulled up by large values and pulled down by smaller values.

Median-Ungrouped Frequency Distribution

Steps involved in Median-Ungrouped Frequency Distribution are

Median - Grouped Frequency Distribution

Steps involved in Grouped Frequency Distribution are

Mode