Q10 of 26 Page 14

Given below are the cumulative frequencies showing the weights of 685 students of a school. Prepare a frequency distribution table.

To Find: Frequency Distribution table

Given: Cumulative frequencies


Concept Used: Cumulative frequency up to a point is the sum of all previous frequencies up to that point.


Explanation:


First, let us find the frequencies:



As in the table, there is a difference of 5 in observation. We can make a table with Class marks having a range of 5.


So, we can start from (25 – 30), (30 – 35), …and so on.


Therefore, a frequency distribution table for data:



More from this chapter

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8

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?

 9

Find out the mode of the following marks obtained by 15 students in a class:

Marks: 4, 6, 5, 7, 9, 8, 10, 4, 7, 6, 5, 9, 8, 7, 7.

 11

Following are the ages of 360 patients getting medical treatment in a hospital on a day:


Construct a cumulative frequency distribution.

 12

The mean of 200 items was 50. Later on, it was discovered that the two items were misread as 92 and 8 instead of 192 and 88. Find the correct mean.