Friday, January 29, 2010

Statistics, Frequency and Frequency Distributions

Statistics: - By “statistics” we mean aggregate or combination of facts affected to a marked extends by multiplicity of causes, numerically expressed and estimated according to reasonable standards of accuracy, collected in a systematic manner and placed in relation to each other.

There are two ways of statistics:

1. Frequency Distribution and

2. Graphical Distribution.

Frequency: - The way to count the number of items a particular value is repeated, is called the frequency of any class.

That means, frequency is the total number of items that a particular value is repeated in a table or data.

Frequency Distributions: - A set of classes together with the frequencies of occurrence of values in again set of data, presented in a tabular form, is referred to as a frequency distribution.




Construct a frequency distribution from the class marks of EEE 36 Batch who got the numbers in total trimester in statistics and probability.

Course:

97, 13, 81, 25, 37, 55, 19, 33, 59, 46, 67, 43, 12, 87, 90, 65, 76, 81, 79, 13, 5, 12, 35, 17, 46, 65, 43, 12, 85, 93,

Solution:

Here, the lowest value=5

And the highest value=97

For this kind of ungrouped data we have to choose k in such a way that 2k number of variables.

Here, k=5

So 2k = 25 = 32 > 30