Use graph paper for this question.
The marks obtained by 120 students in an English test are given below :
|Marks||0 - 10||10 - 20||20 - 30||30 - 40||40 - 50||50 - 60||60 - 70||70 - 80||80 - 90||90 -100|
Draw the ogive and hence, estimate:
(i) the median marks.
(ii) the number of students who did not pass the test if the pass percentage was 50.
(iii) the upper quartile marks.
i. No.of students =120
∴ Median = 60th term through marks of 60 draw a line parallel to x - axis which meets the curve at A. From A draw perpendicular to x-axis, which meets it at A . From A draw a perpendicular to x-axis which
meets it at B.
ii. The upper quartile marks `(Q_3 ) = 3/4 n^(th)` term
`= 3^(th)/4 xx 120= 90^(th) ` term
draw a line parallel to x-axis which meets the 1 curve at C. From C draw perpendicular to x-axis which meets it at D.