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Questions 11–13. A sample of 100 students shows the test scores of 25, 64, …, 35. Calculations show that 25 + 64 + … + 35 = 3,900 and 25^2 + 64^2 + ? + 35^2 = 166,356. 11. The standard deviation of the test scores is closest to (a) 12 (b) 14 (c) 16 (d) 18 (e) 20 12. The instructor increases each test score by 10%, and then adds 5 marks to each score after the 10% increase. As the result of these changes, the mean of the new test scores is closest to (a) 42.9 (b) 44 (c) 47.9 (d) 49 (e) 49.9 13. In question 12, the standard deviation of the new test scores is closest to (a) 9 (b) 10 (c) 12 (d) 13.2 (e) 18.2

          Questions 11–13. A sample of 100 students shows the test scores of 25, 64, …, 35. Calculations show that 25 + 64 + … + 35 = 3,900 and 25^2 + 64^2 + ? + 35^2 = 166,356.
11. The standard deviation of the test scores is closest to
(a) 12 (b) 14 (c) 16 (d) 18 (e) 20
12. The instructor increases each test score by 10%, and then adds 5 marks to each score after the 10% increase. As the result of these changes, the mean of the new test scores is closest to
(a) 42.9 (b) 44 (c) 47.9 (d) 49 (e) 49.9
13. In question 12, the standard deviation of the new test scores is closest to
(a) 9 (b) 10 (c) 12 (d) 13.2 (e) 18.2

Questions 11–13. A sample of 100 students shows the test scores of 25, 64, …, 35. Calculations show that 25 + 64 + … + 35 = 3,900 and 25^2 + 64^2 + ? + 35^2 = 166,356.
11. The standard deviation of the test scores is closest to
(a) 12 (b) 14 (c) 16 (d) 18 (e) 20
12. The instructor increases each test score by 10%, and then adds 5 marks to each score after the 10% increase. As the result of these changes, the mean of the new test scores is closest to
(a) 42.9 (b) 44 (c) 47.9 (d) 49 (e) 49.9
13. In question 12, the standard deviation of the new test scores is closest to
(a) 9 (b) 10 (c) 12 (d) 13.2 (e) 18.2

Added by Walija Z.

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