Discover what geometric sequences are and how they are formed. Learn how to find a common ratio with this Bitesize KS3 maths guide.

The arithmetic mean can be misleading when there are outliers or when looking at historical returns. The geometric mean is most appropriate for series that exhibit serial correlation.

When talking investment portfolios, the geometric mean is also sometimes referred to as compounded annual growth rate or time-weighted rate of return.

You will need to be confident with arithmetic sequences and the 𝑛th term rule to understand these other types of sequences. A geometric sequence contains numbers that are multiplied by a ...