Answer :

(a) Second class interval is 20 – 30


Its lower limit = 20


(b) Last class interval is 50 – 60


Its upper limit = 60


(c) The third class is 30 – 40. Its frequency is 4.


(d) The interval that has a frequency of 10 is 20 – 30.


(e) The lowest frequency is 4 which corresponds to the interval 30 – 40.


(f) Class size = Upper Limit – Lower Limit


Class size is 10.


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