Question: The histogram below presents the compressive strengths of a sample of concrete blocks hardened for 28 days. One rectangle from the histogram is missing. What

The histogram below presents the compressive strengths of a sample of concrete blocks hardened for 28 days. One rectangle from the histogram is missing. What is its height?

0.3 0.25 0.2 0.15 0.1 0.05 17 18 19 20 21 22 23 24 Compressive Strength (mPa) Relative Frequency

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