The number of students taking the Scholastic Aptitude Test (SAT) has risen to an all-time high of more than1.5 million (College Board, August 26, 2008). Students are allowed to repeat the test in hopes of improving 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 TimesNumber of Students 1721,769 2601,325 3166,736 422,299 56,730 What is the variance and standard deviation for the number of times the SAT is taken?

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What is the variance and standard deviation for the number of times the SAT is taken?

A First Course in Probability (10th Edition)

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Question

The number of students taking the 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 improving 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?

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