Can someone please enlighten me what does the permanent status 'mean annual return ' be a sign of contained by mutual funds ?

For Example google finance page show these five risk levels :
Risk

Alpha*
Beta*
Mean annual return
R-squared*
Standard deviation
Sharpe ratio .

I resembling to know what does Mean annual return mean ?

Answers:    Mean is a synonym for average, so it's the average annual return or how much an investment in the fund would hold made on average.

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