Dental-fillings data and population estimates

Dental-fillings data and population estimates

Secondary 2
TGM Original Questions

The numbers of fillings recorded for 30 adults are: 2,0,4,1,3,2,1,6,0,1,5,3,2,4,1,2,0,3,6,1,4,2,3,1,0,5,2,4,3,1.

  1. Draw a dot plot.
  2. Find the mode, median and mean.
  3. Find \(P(X=1)\) and \(P(2\le X\le5)\).
  4. Estimate how many of 300 adults have no fillings.

Solution:

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Answer:(a) completed dot plot with frequencies \(4,7,6,5,4,2,2\); (b) mode \(1\), median \(2\), mean \(2.4\); (c) \(7/30,17/30\); (d) \(40\).

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