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find the frequency before finding the percent total -_- :)
You find the total of all the frequencies, N. Then the percentage for any frequency is 100*frequency/N.
First, you need a frequency table.
The median can be found out by drawing a perpendicular to the x-axis from the intersection point of both the ogives
On the cumulative frequecy diagram, find 50% on the frequency [usually, vertical] axis. Draw a line to the graph and then drop a perpendicular to the other [horizontal] axis. Where it hits the second axis is the median value.