The Mean Weight of Trucks Traveling on a Particular Section

question 7

Multiple Choice

The mean weight of trucks traveling on a particular section of I-475 is not known. A provincial highway inspector needs an estimate of the mean. He selects a random sample of 49 trucks passing the weighing station and finds the mean is 15.8 tonnes, with a standard deviation of the sample of 4.2 tonnes. What is probability that a truck will weigh less than 14.3 tonnes?

• A) 0.0062
• B) 0.3632
• C) 0.1368
• D) 0.4938

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