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In the Unite States, the average peak of tornado activity is in May.
A cumulative frequency polygon has straight lines connecting the points. A normal cumulative frequency diagram uses a smooth curve to join the points.
There is some evidence that tornado frequency might be increasing but it is difficult to determine as with more advanced technology and greater knowledge of tornadoes we are now finding tornadoes that we would have previously missed.
Tornadoes are most common in the central and eastern parts of Mississippi. The frequency of strong tornadoes in those areas rivals that in parts of Tornado Alley.
Relative frequency is a method of calculating the frequency of an event. Percentage frequency is a way of presenting the frequency of an event.