# Bell curve

Arithmetic and Geometric progressions.

### Bell curve

Assume a bell curve. If I am given the 25th and 50th percentile values, how do I calculate the 30th percentile?
Example: 25th percentile salary is 60,000 dollars. 50th percentile salary is 80,000 dollars. What is the 30th percentile salary?
Not looking for the answer, looking for the equation.

THANKS
MLEBOFSKY

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