question_answer

  If the median of the following frequency distribution is 46 find the missing frequencies.

Variable	10-20	20-30	30-40	40-50	50-60	60-70	70-80	Total
Frequency	12	13	?	65	?	25	18	229

Answer:

  Let the frequency of the class 30-40 be and that of the class 50-60 beThe total frequency is 229. It is given that the median is 46. Clearly, 46 lies in the class 40 - 50 . 40-50 is the median class.                                    and Now, Median Since Thus