The following is the frequency distribution for the speed of a sample of automobiles traveling on an interstate highway. $$\begin{array} { c c }
\text { Speed } ( m p h ) & \text { Frequency } \
50 - 54 & 2 \
55 - 59 & 4 \
60 - 64 & 5 \
65 - 69 & 10 \
70 - 74 & 9 \
75 - 79 & \underline { 5 } \
& 35
\end{array}$$ The mean is
A) 35.
B) 670.
C) 10.
D) 67.

Question

The following is the frequency distribution for the speed of a sample of automobiles traveling on an interstate highway. $$\begin{array} { c c } 
\text { Speed } ( m p h ) & \text { Frequency } \
50 - 54 & 2 \
55 - 59 & 4 \
60 - 64 & 5 \
65 - 69 & 10 \
70 - 74 & 9 \
75 - 79 & \underline { 5 } \
& 35
\end{array}$$ The mean is
A) 35.
B) 670.
C) 10.
D) 67.

Quizplus · Accepted Answer

The mean is calculated by finding the midpoint of each speed interval, multiplying by the frequency, summing these products, and dividing by the total frequency. This results in a mean of approximately 67 mph.

The Following Is the Frequency Distribution for the Speed of a Sample