# 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.

#### Read also

- Were the bodies of the Columbia astronauts recovered?
- How many standard deviation away from the mean?
- How do I find the standard deviation of the mean?
- What does the standard deviation of a portfolio mean?
- How do you find the standard deviation of a sampling distribution?
- How does Python calculate standard deviation?
- How many standard deviations are in a normal curve?
- How do you find percentile with standard deviation?
- What percentage is 1.5 standard deviation?
- What is a bad standard deviation?

#### You will be interested

- What is standard deviation above the mean?
- What is the symbol for standard deviation called?
- What is the difference between standard deviation and coefficient of variation?
- How do you find the standard deviation of probability?
- Is standard deviation total risk?
- Is standard error same as standard deviation?
- How do you find the standard deviation of a Dataframe in Python?
- Are standard deviation units squared?
- How do you type the standard deviation symbol?
- How do you do standard deviation error bars in Excel?