Question

The weekly wages (is rupees) of 30 workers in a factory are:
830, 835, 890, 810, 835, 869, 845, 898, 890, 820, 832, 833, 855, 845, 804, 808, 812, 840, 885, 835, 836, 878, 840, 868, 890, 806, 840
Using tally marks make a frequency table with intervals as 800-810, 810-820 and so on

Answer 1

Here, we will make tally marks by keeping count while drawing marks and remember to draw every fifth mark across the previous 4 marks, so we can easily see groups of 5 according to the number of wages of 30 workers.

Complete step by step solution:
We are given that the weekly wages (is rupees) of 30 workers in a factory are 830, 835, 890, 810, 835, 869, 845, 898, 890, 820, 832, 833, 855, 845, 804, 808, 812, 840, 885, 835, 836, 878, 840, 868, 890, 806 and 840.

We know that a tally mark is a way of keeping count by drawing marks and every fifth mark is drawn across the previous 4 marks, so we can easily see groups of 5.

Now, we will form a table for tally marks with intervals as 800-810, 810-820 and so on from the given wages of 30 workers, we get

We will now form a table to calculate the frequency of the tally marks from the above graph, we get

Note:
Students need to know that in tally marks to keep count of marks, every fifth mark is drawn across the previous 4 marks, so we can easily see groups of 5. Do not forget to draw the fifth marks across the previous 4 marks or else the answer will be wrong. This is a simple problem, be careful while finding the wages for each of the intervals.