
Last updated at Sept. 25, 2018 by Teachoo
Transcript
Ex 14.3, 7 The distribution below gives the weights of 30 students of a class. Find the median weight of the students. Weight (in kg) Number of students Cumulative frequency 40 โ 45 2 2 45 โ 50 3 2+3=5 50 โ 55 8 5 + 8=13 55 โ 60 6 13+6=19 60 โ 65 6 19+6=25 65 โ 70 3 25+3=28 70 โ 75 2 28+2=30 Median = l + (๐/2 โ๐๐)/๐ ร h n = โโ๐๐ ๐/2 = 30/2 = 15 โด 55 โ 60 is the median class l = lower limit of median class= 55 h = class-interval= 45 โ 40 = 5 cf = cumulative frequency of the class before median class=13 f = frequency of the median class =6 Median = l + (๐/2 โ๐๐)/๐ ร h = 55 + (15 โ13)/6 ร 5 = 55 + 2/6 ร 5 = 55 + 1.67 = 56.67 So, median weight is 56.67 kg
About the Author