You are given a passage. You need to construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) its answer is the whole paragraph. Avoid creating questions that can be answered correctly without actually understanding the paragraph.

Example Input: This is not something you can see with Yahoo mail. Both the sender and receiver must have an e-mail program (such as Outlook) to utilize return receipt.
Example Output: how can you tell if someone has opened your email?

Example Input: Los Angeles does have a public transit system, including the Metro Red Line and other light rail. However, if you want to get around without a car, you'll have to budget significant time (and I mean significant) to catch connections and lines. Plus, if you miss a connection you can get stranded (I have many times). Not recommended unless you're on the main bus or rail lines. Check the MTA site for more info on transportation routes. Also call their help number--their operators can tell you if a line is particularly problematic!
Example Output: Public transportation options in Los Angeles?

Example Input: for the k-means algo, you start by assuming some centroids, they are initial centroids.

Now, you assign each point to the closes centroid.
After all the points are assigned to some centroid, the centroid for htese new set of point groups are caclualted.
The iteration is carried out till the numbers are sufficientltly close.

I am not sure whether there is an excel function, but do a google search, you might come across some C-code to do the same
Example Output:
How do I use k-means clustering to group observations?