Answer:

b) class mark

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Answer:

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Step-by-step explanation:

Answer: Half of (upper class limit + lower class limit) is Class mark.

So, option (B)Class mark is the correct option.

Class interval: Width of class

Class interval = Upper class limit - Lower class limit

Class mark: Midpoint

Class mark = 1/2(Upper class limit + Lower class limit)

Mean: Arithmetic average of data

Mean = ∑x / N