question_answer

The speed of 120 cars measured at a particular point on country road they are shown in the table alongside. What is the mean speed of the drivers?

Speed V (km/h)	Frequency
\[40\le V<50\]	1
\[50\le V<60\]	3
\[60\le V<70\]	17
\[70\le V<80\]	39
\[80\le V<90\]	48
\[90\le V<100\]	17
\[100\le V<110\]	4

A)  70.3                            

B)  80              

C)  70                               

D)  80.3