Stats Solutions

(Steps Shown) Car speeds again. For the car speed data of Exercise 20 , recall that the mean speed recorded was 23.84 mph, with a standard deviation of

Question: Car speeds again. For the car speed data of Exercise 20 , recall that the mean speed recorded was \(23.84 \mathrm{mph}\), with a standard deviation of \(3.56 \mathrm{mph}\). To see how many cars are speeding, John subtracts 20 mph from all speeds.

  1. What is the mean speed now? What is the new standard deviation?
  2. His friend in Berlin wants to study the speeds, so John converts all the original miles-per-hour readings to kilometers per hour by multiplying all speeds by 1.609 (km per mile). What is the mean now? What is the new standard deviation?

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Solution: The downloadable solution consists of 1 pages
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