In any grouped frequency distribution class intervals are of equal width.

For any frequecy distribution

Define: class-interval

In a frequency distribution having 6 class intervals the total frequency is 100 and cumulative frequency less than type and cumulative frequency more than type corresponding to the fourth class interval are 86 and 50 respectively. Find the frequency of the fourth class interval.

Define frequency density of a class interval.

Mode of frequency distribution can be obtained from

A company manufactures car batteries of particular type. The life (in years) of 40 batteries was recorded as follows: Construct a grouped frequency distribution table with exclusive classes for this data, using class intervals of size 0.5 starting from the interval 2-2.5.

For any distribution m_1 is

Quartiles of a frequency distribution obtained from

A frequency distribution is said to be leptokustic when