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# How to find variance and std dev in R?

# How to find variance and std dev in R?

This recipe helps you find variance and std dev in R

How to find variance and standard deviation in R? Variance is the amount of variation/spread in a data set. The standard deviation is the square root of the variance. Standard deviation and variance are needed for conducting many different statistical tests like to calculate the z-score , t-score etc. This recipe illustrates an example of finding variance and standard deviation.

```
a <- c(5,10,15,20,25,30)
```

```
print(mean(a)) #using mean()
```

"Output is ": 17.5

```
print(var(a)) # using var()
```

"Output is ": 87.5

```
print(sd(a)) # using sd()
```

"Output is ": 9.354143

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