Week 6 topic changed ffrom Numpy to Descriptive statistics part2

During week 5, the topic for week 6 showed Numpy.
When week 6 started the topic changed to descriptive statistics part 2.
Now there is no Numpy in the course curriculum.
Why the topics are being changed? any reason?
Numpy should be included in the course.

Hi anantha, there are weeks of contents added it the already existing curriculum. All the essentials will be covered.