The answer is 1 - scale. Hope this helps.

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1scale

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The numbers that show the units on Graph are known as frequencies of classes. Frequency is the number of data which falls in a specific class. Secondly, the interval in the bar graph is the class interval. This interval is the range of each class and it is obtained when raw data is arranged in small groups. The range of each group or class is known as a class interval and on a bar graph this interval is used.

Intervals

Intervals

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A gorp of number

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Interval

Vertical axis