SCENARIO 6-5 According to Investment Digest, the Arithmetic Mean of the Annual

question 143

Short Answer

SCENARIO 6-5
According to Investment Digest, the arithmetic mean of the annual return for common stocks over an
85-year period was 9.5% but the value of the variance was not mentioned. Also 25% of the annual
returns were below 8% while 65% of the annual returns were between 8% and 11.5%. The article
claimed that the distribution of annual return for common stocks was bell-shaped and approximately
symmetric. Assume that this distribution is normal with the mean given above. Answer the following
questions without the help of a calculator, statistical software or statistical table.
-Referring to Scenario 6-5, 75% of the annual returns will be lower than what value?

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Definitions:

Isoquant Slope

The slope of an isoquant curve represents the rate at which one input can be substituted for another while maintaining the same level of output in production theory.

Input

Resources such as labor, materials, and capital that are used in the production process to create goods or services.

Returns To Scale

The speed at which production levels rise in reaction to an equal rise in all resources, including labor and capital.

Marginal Product

The extra output or benefit received from using one additional unit of a resource.