Frequency Frequency distributiondistribution Subject-Math's Subject-Math's School-KendriyaSchool-Kendriya VidyalayaVidyalaya

frequencyfrequency !!!!• FrequencyFrequency, term used in the , term used in the

physical sciences to denote the physical sciences to denote the number of times that any number of times that any regularly recurring phenomenon regularly recurring phenomenon occurs in one second.occurs in one second.

Class intervalsClass intervals !!!!• Class IntervalClass Interval, , in statistics, the rangein statistics, the range

of each class of data, used when of each class of data, used when dealing with large amounts of data. dealing with large amounts of data. To obtain an idea of the distribution, To obtain an idea of the distribution, the data are broken down into the data are broken down into convenient classes, which must be convenient classes, which must be mutually exclusive and are usually mutually exclusive and are usually equal.equal.

• For, exampleFor, example - 1-10,10-20,20-30.1-10,10-20,20-30.

Tally marksTally marks !!!!• To get a particular information from the

given data can be arranged in tabular form using tally marks

Frequency distribution table !!!!

• A frequency-distribution table summarizes data

for, example-

Subject Subject Tally marksTally marks MarksMarks

Math 5

Science 10

English 4

Hindi 2

Example -Example -

QuestionQuestion -- Construct a frequency Construct a frequency

distribution table for the given distribution table for the given data on weight (in kg) of 20 data on weight (in kg) of 20 student of a class using student of a class using intervals 30-40,40-50,50-60intervals 30-40,40-50,50-60.

Answer -ClassClass

intervalsintervalsTally Tally

marksmarksfrequencyfrequency

30-40 7

40-50 9

50-60 2

60-70 2

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Made. By –Ajay KumarMade. By –Ajay Kumar