FREQUENCY, CLASS FREQUENCY AND TALLY BARS

CUMULATIVE FREQUENCY SERIES, INCLUSIVE SERIES AND SERIES WITH UNEQUAL CLASS INTERVALS

Define the following terms: Observations (ii) Raw data Frequency of an observation Frequency distribution Discrete frequency distribution Grouped frequency distribution class-interval (viii) Class-size Class limits (x) True class limits

The marks scored by 20 students in a test are given below: 54,42,68,56,62,71,78,51,72,53,44,58,47,64,41,57,89,53,87,57. Complete the following frequency table: Marks in class intervals, Tally marks, Frequency (No. of children 40-50 50-60 60-70 70-80 80-90, , What is the class interval in which the greatest frequency occurs?

Introduction|| Collection OF Data||Primary and Secondary Data|| classes|| Class interval|| Class size ( range )|| Presentation OF Group data & Single data ( ungrouped data )||Tally mark||Frequency distribution table

While constructing the cumulative frequency column of a frequency distribution, it is noticed that these cumulative frequencies arein arithmetic progression. Assertion (A) : All the class frequencies are equal. Reason (R) : when all the class frequencies are equal, the cumulative frequencies are arithmetic progression.

State True or False : Cumulative frequency of the last class is the total of all frequencies in the data.

The class marks of a frequency distribution are 15, 20, 25, 30, ..... The class corresponding to the class mark 25 is

From the following frequency table. Find : (a) The frequency of fifth class interval (b) The upper class limit of third class interval. (c) The lower class limit of second class interval. (d) The class mark of sixth class interval.