Mathematics - 3

Raw data

the data collected in original form.

Range

difference of the highest value and the lowest value in the distribution.

Class limits

highest and lowest value in the distribution.

Class boundaries

upper and lower values of a class for group frequency distribution whose values have additional decimal place more than the class limits and end with the digit 5

Interval

distance between the class lower boundary and the class upper boundary and it is denoted by the symbol i.

Frequency

tells the number of times the observation occurs in the data.

Percentage

obtained by multiplying the relative frequency by 100%

Relative Frequency

obtained by dividing the frequency of the class by the total frequency.

Cumulative frequency

total frequencies, in which the frequency of the first class interval is added to the frequency of the second class interval and then the sum is added to the frequency of the third class interval and so on.

Less than Cumulative frequency

the cumulate begins from the lowest to the highest class.

Greater than Cumulative frequency

the cumulate begins from the highest class to the lowest class

Midpoint or Class Mark

the point halfway between the class limits of each class and is representative of the data within that class.