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Question
The class mark of the class 90 – 120 is ______.
Options
90
105
115
120
Solution
The class mark of the class 90 – 120 is 105.
Explanation:
In a given class 90 – 120,
Upper class = 120
And lower class = 90
We know that,
Class mark = `"Upper class + Lower class"/2`
= `(120 + 90)/2`
= `210/2`
= 105
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