(1) What is the size of the class intervals?
(ii) Which class has the highest frequency?
(ii) Which class has the lowest frequency?
(iv) What is the upper limit of the class interval 250-275?
(v) Which two classes have the same frequency?
Answers
Answer:
For most data, 6 to 15 classes are enough
Class intervals (lengths) should be equal. Intervals such as 0.1, 0.2, 0.5, 1, 2, 5, 10, 20, 50, etc are desirable.
The starting point for each class should be divisible by the interval, For example, in the class 15 - 20, the starting point, 15, is divisible by the interval, 5.
Each observation must fit into only one class.
When a large number of points falls around a certain value, make this value the approximate center of the frequency distribution.
Step-by-step explanation:
Class−Interval Frequency
0−10 6
10−20 2
20−30 13
30−40 17
40−50 11
50−60 4
60−70 8
70−80 7
(i) The class interval having highest frequency =30−40
(ii) The class mark of class 50−60 =
2
50+60
=
2
110
=55
(iii) The size of each class interval =10−0=10
Class 0−100−10 has lowest frequency i.e. 1.
The upper limit of the class interval 250-275 is 275. (v) The classes (150–175) and (225-250) are having the same frequency (which is 55).
Answer:
written below-
Step-by-step explanation:
Given: class intervals with frequency
To find: solutions of given questions
SOLUTION-
i) size of class interval 175 -150 =25
ii) highest frequency class =200-225 (because frequency is 140)
(iii) lowest frequency class =300-325 (because frequency is 20)
(iv) upper limit of 250 -275 =275 (upper limit means highest limit)
(v) classes with same frequency =150-175 and 225 -250(Both have frequency as 55)`
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