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**Discrete Frequency distribution.**

**Continuous or grouped frequency distribution.**

**Continuous or Grouped Frequency Distribution - (a) Exclusive Method**

**(b) Inclusive Method**

**Construction of a discrete frequency distribution**

**Construction of a grouped frequency distribution**

**Histogram a histogram or frequency histogram is a graphical representation of a frequency distribution in the form of rectangles with class intervals as bases and heights proportional to corresponding frequencies such there is no gap between any two successive rectangles.**

**Drawing the histogram of a continuous grouped frequency distribution.**