Two unknown frequencies from total and median

Two unknown frequencies from total and median

Secondary 2
TGM Original Questions

For 20 students, the numbers of mistakes 0,2,3,4,5 have frequencies \(6,x,y,4,2\). The median is 2.5.

  1. Form two equations and find \(x,y\).
  2. Hence find the mode and mean number of mistakes.

Solution:

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Answer:(a) \(x+y=8,6+x=10\), so \(x=y=4\); (b) mode \(0\), mean \(2.3\).

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