The following table shows a frequency distribution for the speed of cars passing through a particular spot on a highway:

Class interval $(km/h)$	Frequency
$30-40$	$3$
$40-50$	$6$
$50-60$	$25$
$60-70$	$65$
$70-80$	$50$
$80-90$	$28$
$90-100$	$14$

Draw a histogram and a frequency polygon representing the data above.

(N/A) To draw the histogram and frequency polygon:
$1$. Represent the class intervals $(km/h)$ on the $x$-axis and the frequency on the $y$-axis.
$2$. Draw the histogram by constructing rectangles with widths equal to the class intervals and heights proportional to the frequencies.
$3$. To draw the frequency polygon,mark the midpoints of the top side of each rectangle of the histogram.
$4$. Join these midpoints with straight lines. To complete the polygon,join the first and last midpoints to the midpoints of the preceding and succeeding imaginary class intervals (with frequency $0$) on the $x$-axis.