Use the Grouped Data Formulas to Find the Indicated Mean

question 110

Multiple Choice

Use the grouped data formulas to find the indicated mean or standard deviation.
-A random sample of 30 high school students is selected. Each student is asked how many hours he or she spent on the Internet during the previous week. The results are shown in the histogram. Estimate the sample
Mean.

• A)7.9 hr
• B)7.7 hr
• C)8.1 hr
• D)8.3 hr

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Definitions:

Forecasting Ability

The capability to predict future trends, events, or behaviors based on past and current data.

Complex Reality

The concept that reality is composed of many interacting components that can be difficult to fully understand or predict.

Economic Theory

A set of principles and models that attempts to explain the relationships among economic variables and to predict future economic outcomes.

Realistic Assumptions

Assumptions made in economic models that aim to closely reflect actual conditions and behaviors in the real world.