The Weights of Cockroaches Follow a Normal Distribution with Mean

question 49

Multiple Choice

The weights of cockroaches follow a Normal distribution with mean 80 grams and standard deviation 2 grams. The figure below is the Normal curve for this distribution of weights. About what percent of the cockroaches have weights less than 78 grams?

• A) 47.5 percent
• B) 34 percent
• C) 32 percent
• D) 16 percent
• E) 2.5 percent

---

Definitions:

Genetic Mutations

Changes in the DNA sequence of an organism's genome, which can result in variations in physical appearance, function, or behavior.

Artificial Selection

The human practice of breeding plants or animals for desired traits.

Environmental Change

Alterations in the environment, often caused by human activities and natural ecological processes, affecting ecosystems, weather patterns, and species distributions.

Mass Depletion

Reduction in the abundance of a resource or material over time due to excessive use or exploitation.