Which graph shape illustrates a probability distribution that is symmetrical and bell-shaped?

Which graph shape illustrates a probability distribution that is symmetrical and bell-shaped?

• A. Authority
• B. Benchmarks
• C. Background check
• D. Bell curve

Answer: (D)

A probability distribution that is symmetrical and bell-shaped is the normal distribution, often called the bell curve. Its key feature is symmetry around the center, with a single peak at the mean and tails that taper off evenly on both sides. This shape frequently arises because many independent factors contribute to a measurement, a consequence described by the central limit theorem. The term “bell curve” directly describes this graph, making it the best answer. The other options refer to concepts or terms that aren’t graph shapes, so they don’t describe a probability distribution’s visual form.

A probability distribution that is symmetrical and bell-shaped is the normal distribution, often called the bell curve. Its key feature is symmetry around the center, with a single peak at the mean and tails that taper off evenly on both sides. This shape frequently arises because many independent factors contribute to a measurement, a consequence described by the central limit theorem. The term “bell curve” directly describes this graph, making it the best answer. The other options refer to concepts or terms that aren’t graph shapes, so they don’t describe a probability distribution’s visual form.