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A police officer uses a radar gun to determine the speed of five vehicles traveling on the highway. The speed of those vehicles are

A police officer uses a radar gun to determine the speed of five vehicles traveling on the highway. The speed of those vehicles are as follows. 65, 63, 67, 57, 68 (a) Calculate the average speed of the five vehicles. (b) Calculate the standard deviation of the speeds given in the data set. (Round your answer to three decimal places.)

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