Data Practice: Histogram Widths and Frequency Density

Data Practice: Histogram Widths and Frequency Density

Choose one exact numerical answer in the unit requested. Fractions such as 3/2 mean an exact value; no rounding unless requested. All 20 questions appear in random order. Practice target: 16/20. These are focused mathematics exercises, not a complete examination.
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A frequency-density histogram bar has frequency 30 and height 5. What is its class width?