1.

​​The following table gives the frequency distribution of the percentage of marks obtained by 2300 students in a competitive examination. Marks obtained (in per cent) 11−20 21−30 31−40 41−50 51−60 61−70 71−80 Number of students 141 221 439 529 495 322 153 (a) Convert the given frequency distribution into the continuous form.(b) Find the median class and write its class mark.(c) Find the modal class and write its cumulative frequency.

Answer» ​​The following table gives the frequency distribution of the percentage of marks obtained by 2300 students in a competitive examination.

























Marks obtained

(in per cent)		 11−20 21−30 31−40 41−50 51−60 61−70 71−80
Number of students 141 221 439 529 495 322 153



(a) Convert the given frequency distribution into the continuous form.



(b) Find the median class and write its class mark.



(c) Find the modal class and write its cumulative frequency.


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