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الكلية كلية الهندسة     القسم  الهندسة المدنية     المرحلة 1
أستاذ المادة ناريمان يحيى عثمان الصائغ       03/01/2015 17:13:01
Lecture 3
TECHNICAL OF FORMULETED A FREQUENCY DISTRIBUTION
Nariman Yayha Othman
Technical terms used in formulation frequency distribution
a) Class limits:
The class limits are the smallest and largest values in the class.
Ex:
0 – 10, in this class, the lowest value is zero and highest value is 10. the two boundaries of the class are called upper and lower limits of the class. Class limit is also called as class boundaries.
b) Class intervals
The difference between upper and lower limit of class is known as class interval.
Ex:
In the class 0 – 10, the class interval is (10 – 0) = 10.
The formula to find class interval is gives on below

L = Largest value
S = Smallest value
R = the no. of classes
Ex:
If the mark of 60 students in a class varies between 40 and 100 and if we want to form 6 classes, the class interval would be
I= (L-S ) / K = = = 10 L = 100
S = 40
K = 6
Therefore, class intervals would be 40 – 50, 50 – 60, 60 – 70, 70 – 80, 80 – 90 and 90 – 100.

• Methods of forming class-interval
a) Exclusive method (overlapping)
In this method, the upper limits of one class-interval are the lower limit of next class. This method makes continuity of data.



Ex:
Marks No. of students
20 – 30 5
30 – 40 15
40 – 50 25
A student whose mark is between 20 to 29.9 will be included in the 20 – 30 class.
Better way of expressing is
Marks No. of students
20 to les than 30
(More than 20 but les than 30) 5
30 to les than 40 15
40 to les than 50 25
Total Students 50

b) Inclusive method (non-overlaping)


المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .