Before-and-after weight distributions

Before-and-after weight distributions

Secondary 2
TGM Original Questions

Weights before a programme are 74,68,62,57,81,76,69,64,72,66,59,83,71,65,77,70,63,75,80,67 kg. Afterward they are 69,64,58,54,76,72,65,61,68,62,56,78,67,61,72,66,60,70,75,63 kg.

  1. Draw a back-to-back stem-and-leaf diagram.
  2. Decide whether the programme was effective and justify.

Solution:

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Answer:(a) correct back-to-back diagram; (b) effective: median fell from \(69.5\) kg to \(65.5\) kg and all 20 paired weights fell.

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