The width of each of nine classes in a frequency distribution is 2.5 and the lower class boundary of the lowest class is 10.6. Which one of the following is the upper class boundary of the highest class?
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For continuous class intervals, the boundaries simply stack up:
\[ \text{Upper Boundary} = \text{Start} + (N \times \text{Width}) \]
This direct calculation avoids listing each interval individually.