Exercise

# Additional arguments

Let's use additional arguments in the `.apply()`

method!

Your task is to create two new columns in `scores`

:

`mean`

is the row-wise mean value of the math score, reading score and writing score`rank`

defines how high the`mean`

score is:`'high'`

if the mean value \(> 90\)`'medium'`

if the mean value \(> 60\) but \(\leq\) 90`'low'`

if the mean value \(\leq 60\)

To accomplish this task, you'll need to define the function `rank`

that, given a series, returns a list with two values: the mean of the series and a string defined by the aforementioned rule.

The module `numpy`

is already imported for you as `np`

.

Instructions

**100 XP**

- Calculate the mean of the input series.
- Return the mean and its rank as a list.
- Insert the output of
`rank()`

into new columns of`scores`

.