Answer:
$13,000
Explanation:
You want to know the class width when the class ranges are defined as ...
- $35,000–$47,999
- $48,000–$60,999
- $61,000–$73,999
Class width
The class width is the difference between adjacent corresponding boundaries. These are the differences of the low boundaries.
$48,000 -$35,000 = $13,000
$61,000 -$48,000 = $13,000
The class width is $13,000.
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Additional comment
Often, the class boundaries are defined to be values that cannot be part of the data set. If data is rounded to the nearest dollar, the boundaries might be defined as $34,999.50 and 47,999.50, for example. That way, it is clear that both of the values $35,000 and $47,999 will fall into the first class.
The way the classes are defined here, we have to assume that both $35,000 and $47,999 will fall into the first class. However you define the classes, the class for any given data value should never be ambiguous.
The problem with gaps, such as the gap between 47,999 and 48,000, is that you don't know how to assign an "in-between" value to a class. We have to assume here that the ambiguity is resolved by not allowing any data values in that gap.
For your test, you'll want to know how your curriculum defines class width, data or class range, and class boundary, and the procedure recommended for determining class boundaries.