13. What are the functions of statistics? 14 Explain the importance of Data. 15 Explain the Use of graph. 16. What are the Features of ogives? 17. What are the Points to be considered while selecting an average? 18. Calculate 5 yearly moving average of the number of students studying in an engineering college from the following data. Year: 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 No of students 111 150 175 196 201 203 205 213 203 219 19. A coin is tossed six times. What is the probability of getting head in all the six times? 20. 21. The height of school children of one institution is normally distributed with mean of 54 inches and SD of 12 inches. What percentage of students have height between 46 and 56 inches. From the following details calculate arithmetic mean. Number of employees 10 Income (Rs.) Rs. 890, 880, 845, 875, 920, 940, 550, 905, 975, 530. 2 J-1646 AC