Q. 243.9( 14 Votes )

A class teacher h

Answer :

We may calculate class marks (xi) for each interval by using the relation

xi =

Now taking assumed mean (A) = 16

Mean (x̅) = A +

= 16 +

= 16 – 3.62 = 12.38

So, mean number of days is 12.38 days for which students were absent.

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