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Best-Performing Cars

In 2013, 66 international motoring journalists selected the 10 best-performing cars of the previous 12 months. The brake horsepowers of the top five cars were 730, 565, 571, 197 and 320. (Source: The Telegraph)

a. Find the mean power, rounding to the nearest tenth. The mean of the horsepower of the next five best-performing cars was 402.4. Did the first five cars tend to have more horsepower or less horsepower than the next five cars?

b. Find the standard deviation of horsepower, rounding to the nearest tenth. The standard deviation of the next five cars was 162.07. Did the first five cars tend to have more or less variation than the other five cars?

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