Consider the following frequency distribution representing the heights of 36 students of a class. Find the class mark of its modal class .
Answers
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Given: frequency distribution representing the heights of 36 students of a class
To Find: the class mark of its modal class .
Solution:
Class interval frequency
150 - 155 1
155 - 160 3
160 - 165 10
165 - 170 8
170 - 175 9
175 - 180 5
Modal class is the class of maximum frequency
Hence Modal class is 160 - 165 as it has maximum frequency 10
Class mark of 160 - 165 = ( 160 + 165)/2 = 162.5
Hence the class mark of its modal class is 162.5
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