How to calculate the coefficient. bounce rate fluctuations over the past year?

Question

Analytics

Hello. Please help me find the odds. bounce fluctuations.
It should turn out like in the picture . I can not find the formula by which the coefficient was calculated. fluctuations

Answer 1

I think it means the coefficient of variation:
CV = σ / ǩ,
CV is the coefficient of variation;
σ is the standard deviation for the sample;
ǩ is the arithmetic mean of the spread of values.