Automobiles Traveling on a Road with a Posted Speed Limit

question 35

Multiple Choice

Automobiles traveling on a road with a posted speed limit of 65 miles per hour are checked for speed by a state police radar system.The following is a frequency distribution of speeds. The standard deviation of this distribution is closest to:

• A)5.35
• B)6.81
• C)9.54
• D)10.25

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Definitions:

Mean

The central value of a dataset, calculated as the sum of all the numbers divided by the count of numbers in the dataset.

Variability

The extent to which data points in a statistical distribution or data set diverge from the average or mean, indicating the dispersion in the dataset.

Mean

The arithmetic average of a set of numbers, found by dividing the sum of all numbers in the set by the count of numbers.

Qualitative Variables

Variables that describe or categorize attributes or characteristics that are not numerical but can be observed qualitatively.