```
# Let l be some list of lists, where all elements of lists are numbers
<- list(
l a = 1:10,
b = 11:20,
c = 21:30
)
```

This is a simple `lapply`

example to start things off.

Now let’s take a look at our list `l`

and see it’s structure.

` l`

```
$a
[1] 1 2 3 4 5 6 7 8 9 10
$b
[1] 11 12 13 14 15 16 17 18 19 20
$c
[1] 21 22 23 24 25 26 27 28 29 30
```

Now that we see the structure, we can use the `lapply`

function to get the sum of each list element, the mean, etc.

`lapply(l, sum)`

```
$a
[1] 55
$b
[1] 155
$c
[1] 255
```

`lapply(l, mean)`

```
$a
[1] 5.5
$b
[1] 15.5
$c
[1] 25.5
```

Voila!