Free SAT Section 2: Mathematics Exam Braindumps (page: 8)

Page 8 of 41

Melissa runs the 50-yard dash five times, with times of 5.4 seconds, 5.6 seconds, 5.4 seconds, 6.3 seconds, and 5.3 seconds. If she runs a sixth dash, which of the following would change the mean and mode of her scores, but not the median?

  1. 5.3 seconds
  2. 5.4 seconds
  3. 5.5 seconds
  4. 5.6 seconds
  5. 6.3 seconds

Answer(s): A

Explanation:

Melissa's mean time for the first five dashes is


Her times, in order from least to greatest, are: 5.3, 5.4, 5.4, 5.6, and 6.3. The middle score, or median, is 5.4. The number that appears most often, the mode, is 5.4. A score of 5.3 means that the mean will decrease and that the mode will no longer be 5.4 alone. The mode will now be 5.3 and 5.4. The median, however, will remain 5.4.



  1. Option A
  2. Option B
  3. Option C
  4. Option D
  5. Option E

Answer(s): B

Explanation:



  1. Option A
  2. Option B
  3. Option C
  4. Option D
  5. Option E

Answer(s): A

Explanation:

If a straight line were drawn through as many of the plotted points as possible, it would have a negative slope. The line slopes more sharply than the line y = x (a line with a slope of-1), so the line would have a slope more negative than-1. The line would also have a y-intercept well above the x i-axis. The only equation given with a slope more negative than-1is s=-2(t-15).




The radius of the outer circle shown above is 1.2 times greater than the radius of the inner circle. What is the area of the shaded region?

  1. 6m2
  2. 9m2
  3. 25m2
  4. 30m2
  5. 36m2

Answer(s): B

Explanation:

The area of a circle is equal to r2. The radius of the inner circle is 5 m; therefore, the area of the inner circle is 25m2. The radius of the outer circle is (1.2)(5) = 6 m; therefore, the area of the outer circle is 36. Subtract the area of the inner circle from the area of the outer circle: 36 25 = 9m2.



Page 8 of 41



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