Rexel Limited shares have an annual return of 10%, -20%, 30%, and 20% in the years 2017,

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Question:

Rexel Limited shares have an annual return of 10%, -20%, 30%, and 20% in the years 2017, 2018, 2019 and 2020 respectively.

Calculate the average yearly return. Show all workings.
Calculate the variance. Show all workings.
Calculate the volatility (standard deviation). Show all workings.