Certain Transportation Company Has a Fleet of 210 Vehicles

question 50

Multiple Choice

Certain transportation company has a fleet of 210 vehicles.The average age of the vehicles is 4.25 years, with a standard deviation of 18 months.In a random sample of 40 vehicles, what is the probability that the average age of vehicles in the sample will be less than 4 years?

• A)0.146
• B)0.163
• C)0.180
• D)0.197
• E)0.214

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Definitions:

Dependent Variable

In an experiment, the variable that is being tested and measured, expected to change in response to manipulations of the independent variable.

Independent Variable

The variable in an experiment that is manipulated or changed by the researcher to observe its effect on the dependent variable.

Manipulation

The skillful or artful management or control of something or someone, often in a manner that is somewhat deceptive or underhanded.

Control Group

In experimental research, it refers to the group of participants who do not receive the experimental treatment, offering a baseline comparison for the effects of that treatment.