# Find the Class Mark of the Classes 20-30 and 30-40. - Algebra

Find the class mark of the classes 20-30 and 30-40.

#### Solution

"Class mark" = ("Upper limit"+"Lower limit")/2

∴"Class mark of the class" 20-30 =(30+20)/2=50/2=25

"Class Mark of the class"30-40=(40+30)/2=70/2=35

Concept: Basic Ideas of Probability
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