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Tally marks are used to find

Tally marks, also called hash marks, are a unary numeral system. They are a form of numeral used for counting. They are most useful in counting or tallying on going results, such as the score in a game or sport, as no intermediate results need to be erased or discarded.

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22

Three coins were tossed 30 times. Each time the number of heads occurring was noted down as follows:

0 1 2 2 1 2 3 1 3 0


1 3 1 1 2 2 0 1 2 1


3 0 0 1 1 2 3 2 2 0


Prepare a frequency distribution table for the data given above.

 23

Thirty children were asked about the number of hours they watched T.V. programmes in the previous week. The results were found as follows:

1 6 2 3 5 12 5 8 4 8


10 3 4 12 2 8 15 1 17 6


3 2 8 5 9 6 8 7 14 12


(i) Make a grouped frequency distribution table for this data, taking class width 5 and one of the class intervals as 5-10.


(ii) How many children watched television for 15 or more hours a week?

 2

The difference between the highest and lowest values of the observations is called

 3

The difference between the upper and the lower class limits is called