Answer :
Final answer:
Savane's IQ is 125 according to William Stern's formula.
Explanation:
According to William Stern's IQ formula, Savane's IQ can be calculated by dividing her mental age (5 years) by her chronological age (4 years) and multiplying by 100. The result is:
Savane's IQ = (Mental Age / Chronological Age) x 100 = (5 / 4) x 100 = 125