The Highway Speeds of 100 Cars Are Summarized in the Frequency

question 84

Multiple Choice

The highway speeds of 100 cars are summarized in the frequency distribution below. Find the grouped mean rounded to the nearest tenth of a mile per hour. $$\begin{array} { r | r } \text { Speed (mph) } & \text { Cars } \\\hline 30 - 39 & 3 \\40 - 49 & 19 \\50 - 59 & 51 \\60 - 69 & 17 \\70 - 79 & 10\end{array}$$

• A) 58.5 mph
• B) 54.5 mph
• C) 55.7 mph
• D) 61.3 mph

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