Q1 of 35 Page 195

I have written the number of children belonging to each of 40 families in our locality below—


I prepare a frequency distribution table of the above given data whose classes are 0 –2, 2–4, ……. etc.


From this frequency distribution table, let me understand and write


(i) class - interval


(ii) class - size


(iii) frequency of the class


(iv) class - limit.

class - size = upper class boundary – lower class boundary

lower class boundary = lower limit - 0.5


Upper class boundary = upper limit + 0.5


Mid value of class


Frequency density


From the given data, we can see that number of children in the range 0 - 2 belongs to 11 families, Similarly for other ranges Table is formulated below, Using the above formulas.



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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.

 4

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.

 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.