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Load and attach the data set central.park (UsingR). The WX variable contains a list of numbers...

Load and attach the data set central.park (UsingR). The WX variable contains a list of numbers representing bad weather (e.g., 1 for fog, 3 for thunder, 8 for smoke or haze). NA is used when none of the types occurred. Make a table of the data, then make a table with the extra argument exclude=FALSE. Why is the second table better?

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