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.
$$\begin{array} { r | r }
\text { Speed (mph) } & \text { Cars } \
\hline 30 - 39 & 3 \
40 - 49 & 16 \
50 - 59 & 52 \
60 - 69 & 16 \
70 - 79 & 13
\end{array}$$
A) 59.3 mph
B) 56.5 mph
C) 62.2 mph
D) 54.5 mph

Question

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.
$$\begin{array} { r | r } 
\text { Speed (mph) } & \text { Cars } \
\hline 30 - 39 & 3 \
40 - 49 & 16 \
50 - 59 & 52 \
60 - 69 & 16 \
70 - 79 & 13
\end{array}$$  
A) 59.3 mph
B) 56.5 mph
C) 62.2 mph
D) 54.5 mph

Quizplus · Accepted Answer

To find the mean, calculate the midpoint for each speed interval, multiply by the frequency, sum these products, and divide by the total number of cars. The calculation is: [(34.5*3) + (44.5*16) + (54.5*52) + (64.5*16) + (74.5*13)] / 100 = 56.5 mph.

Find the Mean of the Data Summarized in the Given