Use the Following Table to Answer Questions )

question 21

Multiple Choice

Use the following table to answer questions ) . A random sample of adults was asked to respond to a
survey about whether they use their cell phones to shop for a specific item. One question, summarized in the table
below reflecting probabilities, asked each respondent to choose whether or not they use a cell phone app to shop.
The major age groupings were under 40 or 40 years or older.
-Which of the following are mutually exclusive events in this study?

• A)Adults over 40 years of age and uses a cell phone app for shopping.
• B)Adult is over 40 years of age and does not use a cell phone app for shopping.
• C)Adult is under 40 years of age and does not use a cell phone app for shopping.
• D)None of these choices.

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Definitions:

Standard Deviation

An index quantifying how much data points deviate or scatter from their average.

Mean

The average of a set of numbers, calculated by adding them together and then dividing by the number of numbers.

Value

The degree of importance, worth, or usefulness of something.

Plowback Ratio

The proportion of earnings retained by a company after dividends have been paid, for reinvestment in its core business.