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CBSE Class 10 Answered

Ogives
Asked by | 31 Oct, 2008, 11:56: PM
answered-by-expert Expert Answer

You must have recieved the instructions below for your earlier question . If you still need help , please  revert.

Given class intervals and the corresponding frequencies , make a column for Cummulative frequesncy .

For less than Ogive, plot upperlimits of intervals on the Horizontal axis and corresponding Cummulative frequencies on the vertical axis. Join , freehand the points so obtained .

 

Now for more than Ogive, on the same graph as above,plot lowerlimits of intervals on the Horizontal axis and corresponding Cummulative frequencies on the vertical axis. Join , freehand the points so obtained .

 

The point of intersection of the two curves obtained  gives the median. From this point draw a perpendicular to the horizontal axis . The point where the perpendicular meets the x axis is the median.

Answered by | 01 Nov, 2008, 10:20: AM
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