Which of the Following Formulas Will Compute the Variance of a Discrete

question 43

Multiple Choice

Which of the following formulas will compute the variance of a discrete random variable X?

• A)\(\sum_{j=1}^{n}\left(x_{j}-E[X]^{2}\right)\)
• B)\(\sum_{j=1}^{\infty} \mathrm{E}[X]^{2} f\left(x_{j}\right)\)
• C)\(\sum_{j=1}^{\infty}\left(x_{j}-E[X]\right)^{2} f\left(x_{j}\right)\)
• D)\(\sum_{j=1}^{\infty}\left(x_{j}\right) 2 f\left(x_{j}\right)\)

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Definitions:

Government Programs

Initiatives and services provided by the government, funded by government revenue, to meet public needs.

Import Quota

A government-imposed limit on the quantity or value of a particular product that can be imported into a country over a specified time period.

Foreign Firms

Businesses that operate in a country other than where their original headquarters are located.

Revenue Decrease

A decline in the amount of money received from sales or services over a certain period.