So I wanted to create a Histogram with a custom number of bins. Luckily there is a simple function for this in the form of `Histogram[data, n]` where n specifies the number of bins. There is even an example of using it in the documentation:

```
data = RandomVariate[NormalDistribution[0, 1], 200];
Histogram[data, 5]

```

Problem is that this doesn't produce a Histogram with five bins but with seven bins: 

![Mathematica graphics](https://i.stack.imgur.com/sa0Ky.png)

`Histogram[data, 6]`still gives seven bins:

![Mathematica graphics](https://i.stack.imgur.com/Iv6Ka.png)

`Histogram[data, 7]` also gives seven bins:

![Mathematica graphics](https://i.stack.imgur.com/ptj1t.png)

But `Histogram[data, 10]` gives thirteen bins:

![Mathematica graphics](https://i.stack.imgur.com/TMs7c.png)

Now I am utterly confused. Is this a bug or have I misunderstood something completely? How would I go about producing a Histogram with five bins?