Use the following information for the question. The average travel time to work for a person living and working in Kokomo, Indiana is 17 minutes. Suppose the standard deviation of travel time to work is 4.5 minutes and the distribution of travel time is approximately normally distributed.
-Approximately what percentage of people living and working in Kokomo have a travel time to work that is less than 15.5 minutes? Round to the nearest whole percent.
A)63%
B)37%
C)25%
D)None of these.

Question

Quizplus · Accepted Answer

To find the percentage of people with a travel time less than 15.5 minutes, calculate the z-score: z = (15.5 - 17) / 4.5 = -0.33. Using a standard normal distribution table, a z-score of -0.33 corresponds to approximately 37%.

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