Completing a patient-age histogram

Completing a patient-age histogram

Secondary 2
TGM Original Questions

Patient ages are grouped into \(0<x\le10,10<x\le20,20<x\le30,30<x\le40,40<x\le50\). Frequencies are 240,180,unknown,210,120. The scaled partial histogram shows the first three bars.

    1. Use it to find the missing frequency.
    2. Complete the histogram.
  2. Find the percentage older than 30, to 1 decimal place.

Solution:

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Answer:(a)(i) \(150\); (ii) add bars 210 and 120; (b) \(36.7\%\).

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