The Normal Distribution Has a Greater Percentage of Its Area

question 246

Multiple Choice

The normal distribution has a greater percentage of its area close to the mean and much less in the tails.
-Which of the following is true about the distribution of IQ scores?

• A) It is a standard normal distribution.
• B) The area under its bell-shaped curve is 5.
• C) The area under its bell-shaped curve is 1.
• D) Its distribution is skewed to the left.

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Definitions:

Positive Control

A genetic control system in which a regulatory protein binds to DNA, turning on transcription of a gene. Compare with negative control.

Operon

A functioning unit of DNA containing a cluster of genes under the control of a single promoter, found in prokaryotes and some viruses.

Repressible Genes

Genes whose expression can be decreased or halted in response to specific stimuli or conditions, as part of cellular regulatory mechanisms.

Transcribed

The process in which a segment of DNA is copied into RNA by the enzyme RNA polymerase.