Exercise

# BMI of villains

Let's return to the `heroes`

dataset containing the information on different comic book heroes. We added a `bmi`

column to the dataset calculated as `Weight`

divided by `(Height/100)**2`

. This index helps define whether an individual has weight problems.

Your task is to find out what is the mean value and standard deviation of the BMI index depending on the character's `'Alignment'`

and the `'Publisher'`

whom this character belongs to. However, you'll need to consider only those groups that have more than 10 valid observations of the BMI index.

Tip: use `.count()`

to calculate the number of valid observations.

Instructions

**100 XP**

- Group the data by the two factors specified above.
- Filter groups having more than 10 valid
`bmi`

observations. - Group the filtered data again by the same factors.
- Calculate the mean and standard deviation of the BMI index.