To make the graph symmetrical
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Usually because the frequencies at one or both ends of the distribution are very small.
they may be necessary in certain situations to avoid a large number of empty ,or almost empty, classes.
a cumulative frequency graph mearsure the cumulative frequency on the y-axis and the class boundaries on the x-axis
The class is not full.
What is the wall thickness of B class G.I pipe? what is the weight per meter of B class G.I pipe