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.