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The weight of trucks traveling on a particular section of I-475 has a population mean of...

The weight of trucks traveling on a particular section of I-475 has a population mean of 15.8 tons and a population standard deviation of 4.2 tons.

a-       What is the probability a state highway inspector could select a sample of 49 trucks and find the sample mean to be 14.3 tons or less?

b-       What is the probability a state highway inspector could select a sample of 64 trucks and find the sample mean to be 14.3 tons or more?

Math   Statistics-And-Probability   
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