The Amount of Time Workers Spend Commuting to Their Jobs

question 34

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

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