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In a frequency distribution table with 12 classes, the class-width is 2.5 and the lowest class boundary is 8.1, then what is the upper class boundary of the highest class?

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Best answer

Upper class boundary = Lowest class boundary + width × number of classes 

= 8.1 + 2.5 × 12 

= 8.1 + 30 

= 38.1 

Thus, upper class boundary of the highest class is 38.1.

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