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Find the Mean of the Data Summarized in the Given

question 107

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Find the mean of the data summarized in the given frequency distribution.
-The highway speeds of 100 cars are summarized in the frequency distribution below. Find the mean speed.  Speed (mph)   Cars 30−39340−491750−595160−691670−7913\begin{array} { r | r } \text { Speed (mph) } & \text { Cars } \\\hline 30 - 39 & 3 \\40 - 49 & 17 \\50 - 59 & 51 \\60 - 69 & 16 \\70 - 79 & 13\end{array}

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