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A discontinuous distribution has classes 1-10, 11-20, 21-30. To draw a histogram we make them continuous by:

Class 9Bar Graphs and HistogramsStatistics and Probability
  • ASubtracting 0.5 from each lower limit and adding 0.5 to each upper limit
  • BDoubling each limit
  • CRemoving the gaps by ignoring them
  • DAdding 1 to every value

Step-by-Step Solution

Half of the gap (1) is 0.5; subtract 0.5 from lower limits and add 0.5 to upper limits to get continuous classes like 0.5-10.5.
Answer: A) Subtracting 0.5 from each lower limit and adding 0.5 to each upper limit

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