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Veritas Prep
A certain list of 300 test scores has an arithmetic mean of 75 and a standard deviation of \(d\), where \(d\) is positive. Which of the following two test scores, when added to the list, must result in a list of 302 test scores with a standard deviation less than \(d\)?
A. 75 and 80
B. 80 and 85
C. 70 and 75
D. 75 and 75
E. 70 and 80
OA D
A certain list of 300 test scores has an arithmetic mean of 75 and a standard deviation of \(d\), where \(d\) is positive. Which of the following two test scores, when added to the list, must result in a list of 302 test scores with a standard deviation less than \(d\)?
A. 75 and 80
B. 80 and 85
C. 70 and 75
D. 75 and 75
E. 70 and 80
OA D
