The number of students taking Scholastic Aptitude Test (SAT) has risen to an all-time high of more than 1.5 million (College Board, August 26, 2008). Students are allowed to repeat the test in hopes of enhancing the score that is sent to college and university admission offices. The number of times the SAT was taken and the number of students are as follows.
Number of Times Number of Students
1 721,769
2 601,325
3 166,736
4 22,299
5 6,730
What is the Variance and Standard deviation for the number of times the SAT is taken (to 4 decimals)?