A researcher distributes frequencies into the following intervals: 1-10, 11-20, 21-30, 31-40, 41-50, and 51 and above. What is wrong with this frequency distribution?
A. The interval width is too small.
B. The interval width is unequal.
C. The class intervals overlap.
D. One interval is an open class.
Ans: D
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a. Notebooks c. Tools b. Rubrics d. Video cameras
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