# What are the mean and standard deviation of {34, 98, 20, -1200, -90}?

##### 2 Answers

Mean = 227.6

Standard deviation = 489.9492

#### Explanation:

Calculate the **mean** as the sum of the numbers divided by the number of observations

Mean

Calculate the **standard deviation** as the square root of the sum of the squared difference each observation and the mean divided by the number of observations.

Standard deviation

**Mean:** **standard deviation is**

#### Explanation:

Data:

Mean :

Variance square differences are

Average variance square differences is

Standard deviation is