The Distribution of Scores on a Test Is Mound-Shaped and Symmetric

question 155

Multiple Choice

The distribution of scores on a test is mound-shaped and symmetric with a mean score of 78. If 68% of the scores fall between 72 and 84, which of the following is most likely to be the standard deviation of the distribution?

• A) 6
• B) 2
• C) 3
• D) 12 3 Use Chebyshev's Rule

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Definitions:

Underlying Purposes

Fundamental reasons or motives behind actions or decisions, often not immediately apparent.

Negative Elements

Components or aspects of a situation, proposal, or environment that are harmful or undesirable.

Informative Message

A communication that aims to enlighten or inform the recipient about specific facts or details.

Order of Importance

A method of organizing information or arguments by arranging them from the most significant to the least significant or vice versa.