If the classmarks of a frequency distribution are 10,15,20,25 and 30.The last class boundary of the distribution is :
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Step-by-step explanation:
The class marks of a frequency distribution are given as: 15, 20, 25, ...
Class size for the given frequency distribution is: 20-15=5
To find the class corresponding to the class mark 20:
We will use the formula
upperlimit = classmarks +class size/2
20+5/2 = 40+5 /2= 45/2
lowerlimit= classmark - classsize/2
20-5/2=35/2=17.5
Hence, 17.5-22.5 is the corresponding class to the classmark 20
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