For which of the following applications would you use a K-Means algorithm for?
(1) Weather prediction given humidity, past record, time of year and cloud density.
(2) Given a huge set of emails, segregation between the spam and non-spam ones.
(3) Given a set of news articles from many different websites, find out what topics are the main topics covered
(4) Given a database of information about your users, automatically group them into different market segments.
There seems ambiguity in the answer, informed the backend team, will be updated very soon after discussion with the mentor.
As except 1, we can apply kmeans clustering on all three.
Happy Learning 
I hope I’ve cleared your doubt. I ask you to please rate your experience here
Your feedback is very important. It helps us improve our platform and hence provide you
the learning experience you deserve.
On the off chance, you still have some questions or not find the answers satisfactory, you may reopen
the doubt.