Answered: Average number of times the SAT is…

Average number of times the SAT is taken is equal to: b) The standard deviation of the number of times a student takes the SAT equals:

Holt Mcdougal Larson Pre-algebra: Student Edition 2012

1st Edition

ISBN:9780547587776

Author:HOLT MCDOUGAL

Publisher:HOLT MCDOUGAL

Chapter11: Data Analysis And Probability

Section: Chapter Questions

Problem 8CR

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Question

x	1	2	3	4	5	6
p(X=x)	0.110	0.234	0.312	0.234	0.094	0.016

The number of students taking the SAT test has reached a record high of over 1.5 million (College Board, Aug. 26, 2008). Students were able to retake the test in hopes of improving the score that is submitted to American college and university admissions offices. Let X be a random variable indicating the number of times a student takes the SAT test with the following probability distribution:

a) Average number of times the SAT is taken is equal to:

b) The standard deviation of the number of times a student takes the SAT equals:

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