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Ogive is an free hand uprising curve
First, get a pencil, some paper and a stencil of an Ogive. Then you fill in the stencil. Job done
yes. An ogive is also known as a cumulative frequency graph.
An ogive is a cumulative relative frequency diagram. Interpolation is definiting the midpoint (50%) of this line
The ogive never close because they represent non-decreasing functions, and polygon you close it.