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Mathematics 2008 Question Papers

Q. 30. The median of the following data is 52.5. Find the values of x and y if the total frequency is 100.

Class Interval	Frequency
0 -1	2
10 – 20	5
20 – 30	x
30 – 40	12
40 – 50	17
50 – 60	20
60 – 70	y
70 – 80	9
80 – 90	7
90 – 100	4

Sol.

Class Interval	Freq. (fi)	cfi
0 - 10	2	2
10 - 20	5	7
20 - 30	x	7 + x
30 – 40	12	19 + x
40 - 50	17	36 +x
50 – 60	20	56 + x
60 – 70	Y	56 + x + y
70 – 80	9	65 + x + y
80 -  90	7	72 + x + y
90 – 100	4	76 + x + y
	100  (Same)

Mathematics 2008 Question Papers Class X
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