Question

what is the class size of observation ​

Answer 1

Answer:

At the time of each observation (i.e., each ten second time interval) a note was made of the number of children in the classroom; the term 'class size' therefore describes the number of pupils in the classroom at the time (what we have called the 'experienced' class size), rather than a notional number on the register....

Explanation:

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Answer 2

Class size: Difference between the true upper limit and true lower limit of a class interval is called the class size. ... Class mark: Mid-value of each class interval is called its class mark.