please answer all the questions thanku!

As we know, there are two types of people in this woridi those who know prograntring ard those who dorit. To prove this once and for all, you take a random sampling of students and put them through a programming teat. Assume that the test is entirely fair and that it reflects the exact level of vill esch student has. You abo ask them to fill out a small questionnaire about their experience with the course CS. You recelve the results for each student as [Exam grade, Hour spent on CS]. That is, if Alce has toent 90 hours on CS and received a score of 74 on the oxam, you will have [74,90] as a data poirt. Blsed on your initial purposes, what should you choose as k ? Should you apply sealing to this data? Yes No You run your clustering algorithm and get two clusters: CLUSTER 1 CLUSTER 2 Results look good - there are indeed two kinds of people, and curicusly one kind seoms to absolutely looe cS. However, when you rerun the code, you get the following clusters: CLUSTER 1 CLUSTER 2 You don't know what to beliewe fand, indeed, there's no resson for you to choose one over anctherl what can you do to fix this and get a stable result? Let k=3 Add more students Add "student name length" as a feature