What is a good standard deviation in investing?

What is a good standard deviation in investing?

Standard deviation allows a fund's performance swings to be captured into a single number. For most funds, future monthly returns will fall within one standard deviation of its average return 68% of the time and within two standard deviations 95% of the time.

What is the mathematical symbol for standard deviation?

σ

What is the symbol of deviation?

Probability and statistics symbols table

Symbol	Symbol Name	Meaning / definition
var(X)	variance	variance of random variable X
σ2	variance	variance of population values
std(X)	standard deviation	standard deviation of random variable X
σX	standard deviation	standard deviation value of random variable X

What test is used to compare two means?

The compare means t-test is used to compare the mean of a variable in one group to the mean of the same variable in one, or more, other groups. The null hypothesis for the difference between the groups in the population is set to zero. We test this hypothesis using sample data.