The following LOs are achieved by the student by completing the End semester exam successfully: 1. Critically evaluate any two libraries and their usage in Python. 2. Discuss the role of data cleansing before performing the analysis on Big Datasets. NaN 88 44 67 99 1. In the given scenario sales of sales staff are given for year1 and year2. Staffld Year1 Year2 Year3 Year4 S001 20 99 95 97 SOO2 98 80 76 S003 55 69 99 NaN SOOS 56 56 NaN 50 S004 16 NaN 79 SOO7 78 75 75 S010 NaN 60 47 S099 78 NaN 95 S101 48 NaN 90 95 Using the Python programming, filter and produce the code for data cleaning and analyze the importance of data cleaning with suitable example. Produce the code for calculating "Average sales for each year". (20 Marks) (Note: Sample code is expected. attributes from above table should be used for data cleaning and calculations.) Marking Scheme Discussion of Data Cleaning-8 marks, Producing the codes - 12 marks