class mark and class size of the class interval are 25 and 10 respectively then the class interval is
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Answer:CLASS INTERVAL IS 20-30
Step-by-step explanation:Lower limit = l
Upper limit = u
Class size = u - l
=> 10 = u - l
=> 10 + l = u
Class mark = ( u + l )/2
=> 25 = ( u + l )/2
=> 25*2 = u + l
Putting value of u,
=> 50 = 10 + l + l
=> 50 - 10 = 2*l
=> 40/2 = l
=> l = 20
So, u = l + 10 = 30
Class interval : 20 - 30
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