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marks less than 10=22
marks less than 20= 22+38=60
marks less than 30=22+38+46=106
marks less than 40 =22+38+46+35=141
marks less than 50=22+38+46+35+20=161
therefore median =20+{(161/2-60)/46}×10
=20+{(80.5-60)/46}×10
=20+205/46
=20+4.456
=24.46
marks less than 20= 22+38=60
marks less than 30=22+38+46=106
marks less than 40 =22+38+46+35=141
marks less than 50=22+38+46+35+20=161
therefore median =20+{(161/2-60)/46}×10
=20+{(80.5-60)/46}×10
=20+205/46
=20+4.456
=24.46
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