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x Classification :-, The process of grranging, the data into different classes, according to their common characteristics, is, called, as classificaetion,, OR., The process of arranging data in, homogeneous fnon-overslapping groups, according to, similamities, is called as, classification., Tabulation 8-, If the data is arranged in, then it is called as, TO WS and coloumns, tabulation., Marks, No.of Students ·, 0-10, 7, 10 - 20, 20-30, 15, 30 -40, 40-50, 9.

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Date, Class intenr val 8-, The obser vation, have common similarities crre put, Into a grouup is knowD as classinter val,, cwhich, or sampling class-, In the above table, 30-40, 40 -50, That is class, 10-20 is second class, L40-50 is, 0-10, 10-20, 20-30,, are the class interrvals., o-10 is fist class inters val, and like that, ९g., last ela ilass intersval., Class, limits %-, designating, called, The two nupobers, the class interval are, class limits ·, The lowest value is called locweg class, limit, the highest value is called, Uppes limit value., In the above table for the class 20-30, class limits:, 20 and 30 are, 20 is lowen limit of a dass, and, 30 is, uppes lirmit of a class., Class-width :- (Class length),, The difference between uupper, limit & lower limit of a class is called, Tength of hat, class width or, the, class. &, class, width is, denoted by notations hi