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The mark of the class `90-120` is

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The mark of the class `90-120` is
A. 90
B. 105
C. 115
D. 120
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Correct Answer - B
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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