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P. 117

TALLY MARKS


            To represent data with small number we draw a pictograph. For data with large
            numbers it is not practical to draw a number of pictures. So we draw tally marks

            to represent such number.

            A tally mark is a vertical line. We draw one vertical line for one observation.
            After four vertical lines, for the fifth observation, we draw a line crossing the

            four vertical lines.


            Example: Tom and Jerry went to a park with their friends. There they saw a

                           variety of animals.



                             sparrow           rat          parrot       sparrow           dog           crow


                              parrot           rat        sparrow         squirrel          rat          crow


                             squirrel        parrot       sparrow            rat        squirrel           rat

                             sparrow          dog          squirrel       parrot        sparrow        sparrow


                              parrot          dog          squirrel        crow             rat          crow




                           Classify the data using tally marks and answer the questions.

                           (a) Which animal was the greatest of number in the park?

                           (b) Which animal was the least of number in the park?

                           (c) How many sparrows were  than the squirrel?

                           (d) Which birds were equal in number?


            Solution:
                                 Animals                Tally marks                Number of animals



                               sparrow                                                          7


                               rat                                                              8



                               parrot                                                           5




                                                              117
            Data Handling
                                                          Mathematics-3
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