According to Atterberg, the soil is said to be of medium plasticity if the plasticity index PI is

- 1
  
  $0 < P I < 7$
- 2
  
  $7 \leq P I \leq 17$ `
- 3
  
  $17 < P I < 27$
- 4
  
  $P I \geq 27$

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