Subject: Mathematics
Answer:
For example, if we have the data which is Midyear test of 45 students in Mathematics 10.
Midyear test of 45 students in Mathematics Grade 10
Class FREQUENCY
40 – 42 1
37-30 0
34 – 36 2
31- 33 2
28-30 14
25-27 15
22 – 24 5
19- 21 6
(25+ 27)/ 2 = 26
The class mark of 25 to 27 is 26.
The following re numerical values that are relevant in dealing with frequency distribution.
1. Class boundaries- They are often described as the true limits because these are more precise expressions of class limits. The lower boundary of a class is 0.5 less than its lower limits, and its upper boundary is 0.5 more than its upper limit.
For example;
In the class 25- 27 , the lower boundary is 25 - 0.5 = 24.5 and the upper boundary is 27 + 0.5 = 27.5
2. Cumulative frequency -there are two kinds of cumulative frequency for a class. The less than cumulative frequency of a class is found by adding the frequency of a class is found by adding the frequency of the class and the frequencies of the lower class.
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