Q4 of 35 Page 195

Mitali and Mohidul wrote below the amount of money of electricity bills for this month of the 45 houses of their village.

116, 127, 100, 82, 80, 101, 91, 65, 95, 89, 75, 92, 129, 78, 87, 101, 65, 52, 59, 65, 95, 108, 115, 121, 128, 63, 76, 130, 116, 108, 118, 61, 129, 127, 91, 130, 125, 101, 116, 105, 92, 75, 98, 65, 100.


I construct a frequency distribution table for the above data.

lower class boundary = lower limit - 0.5

Upper class boundary = upper limit + 0.5


Mid value of class


class - size = upper class boundary – lower class boundary


Frequency density = class frequency of that class/class size


From the given data, we can see that electricity bill in the range 50 - 60 are 2 .Similarly for other ranges Table is formulated below. Using the above formulas.



The class limit in this table is exclusive type


More from this chapter

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2

Given below are the marks obtained by 40 students in a test school:


I construct a frequency distribution table of these marks by taking the classes 1–10, 11–20, ……41–50.

 3

There are many oranges in a busket. From this busket, by aimlessly taking 40 oranges I wrote below their weights (gm):

45, 35, 30, 55, 70, 100, 80, 110, 80, 75, 85, 70, 75, 85, 90, 75, 90, 30, 55, 45, 40, 65, 60, 50, 40, 100, 65, 60, 40, 100, 30, 45, 84, 70, 80, 95, 85, 70.


Now, I construct a frequency distribution table and a less than type cumulative frequency distribution table for the above given data.

 5

Maria has written the ages of 300 patients of a hospital in the table given below:

I construct a more than type cumulative frequency distribution table for the above data.


 6

Let us observe the following cumulative frequency distribution table and construct a frequency distribution table: