The Amount of Time Workers Spend Commuting to Their Jobs

question 121

Multiple Choice

The amount of time workers spend commuting to their jobs each day in a large metropolitan city has a mean of 70 minutes and a standard deviation of 20 minutes. Assuming nothing is known about the shape of the distribution of commuting times, what percentage of these commuting times are between 30 and 110 minutes?

• A) at least 0%
• B) at least 75%
• C) at least 89%
• D) at least 95%

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Definitions:

Coefficient

A numerical or constant quantity placed before and multiplying the variable in an algebraic expression, often representing a measure of some property.

Midpoint Formula

A method used in geometry and economics to find the midpoint or the average of two points on a line segment.

Consumer Expenditure

The total amount spent by consumers on goods and services in a given period.