Correct Answer: C

Rationale: The correct answer is C: Bell-shaped. A symmetric distribution with a single peak is characteristic of a bell-shaped distribution, also known as a normal distribution. This distribution forms a symmetrical, bell-like curve when graphed.
Choice A, 'Uniform,' would describe a distribution where all values have equal probability.
Choice B, 'Bimodal,' would indicate a distribution with two distinct peaks.
Choice D, 'Skewed right,' suggests a distribution where the tail on the right side is longer or more pronounced, unlike the symmetrical bell-shaped distribution described in the question.

Correct Answer: A

Rationale:
To find the length of the unknown leg (a) of a right triangle, use the Pythagorean theorem: a² + 9² = 19². Substitute the known values, solve for a: a² + 81 = 361. Subtract 81 from both sides to get a² = 280. Taking the square root of 280 gives a ≈ 16.7 feet.
Therefore, the correct answer is 16.7 feet.
Choice B (16.0 feet) is incorrect as it does not accurately round to the nearest tenth.
Choice C (17.4 feet) and choice D (8.4 feet) are incorrect as they do not match the calculated value using the Pythagorean theorem.

Correct Answer: D

Rationale: After one friend eats half of the pizza, there is half left. This remaining half is divided equally among three friends.
To find the portion each of the other three friends receives, we divide 1/2 by 3, which equals 1/6.
Therefore, each of the other three friends receives 1/6 of the pizza.
Choice A, 1/5, is incorrect because the correct portion is 1/6.
Choice B, 1/3, is incorrect as each of the three friends receives 1/6.
Choice C, 1/4, is incorrect as well since the correct portion is 1/6.

Correct Answer: D

Rationale:
To convert a fraction to a percentage, you multiply the fraction by 100. In this case, 3/4 * 100% = 75%.
Therefore, the correct answer is D.
Choice A (57%) is incorrect as it does not represent the fraction 3/4.
Choice B (7.50%) is incorrect as it is not the equivalent percentage of 3/4.
Choice C (65%) is incorrect as it does not match the percentage value of 3/4.

Correct Answer: A

Rationale: A factor is a number that can be multiplied by another number to produce a third number. When you multiply factors together, you get the original number. For example, the factors of 12 are 1, 2, 3, 4, 6, and 12 because these numbers can be multiplied in pairs to give the product 12.
Choice B is incorrect as it describes a divisor.
Choice C is incorrect because factors are only multiplied, not divided.
Choice D is incorrect because factors can be any number, not just those greater than 1.