Using a graph paper, draw an ogive for the following distribution which shows the marks obtained in the General Knowledge paper by 100
Marks0−1010−2020−3030−4040−5050−6060−7070−80NO. of Student5102025151294
Use the ogive to estimate:
(i) the median.
(ii) the number of students who score marks above 65 .
36, 8
MarksNo. of studentsc.f0−105510−20101520−30203530−40256040−50157550−60128760−7099670−804100100
Here n = 100, which is even.
i) Median = (n/2)th term = 50th term
From the graph we observe that median is = 36.
ii) The number of students who score above 65 = 100 – 92
= 8