1. Learn
    2. /
  2. Courses
    3. /
  3. Practicing Coding Interview Questions in Python

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.