# Geometric Mean

#### bubble1421

I don't know why I can't figure this one out tonight. I just can't think straight and I am hoping someone can help ASAP.

Here is the question:
In 1998 revenue from gambling was $651 million. In 2001 the revenue increased to$2.4 billion. What is the geometric mean annual increase for the period?

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#### mathman

Since the difference in the number of years is 3, you have to take the cube root of the ratio to get your result.

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