Calculate the mean, variance, standard deviation, and mode for the given grouped frequency distribution.

To compute the mean, variance, standard deviation, and mode for the given grouped frequency distribution, we first need to determine the class mark ($x$) for each interval and then calculate the sums required for the formulas.

Here is the table with the necessary calculations:

Class Interval	Frequency (f)	Class Mark (x)	$fx$	$x^2$	$fx^2$
0 - 5	9	2.5	22.5	6.25	56.25
6 - 11	16	8.5	136.0	72.25	1156.00
12 - 17	16	14.5	232.0	210.25	3364.00
18 - 23	18	20.5	369.0	420.25	7564.50
24 - 29	5	26.5	132.5	702.25	3511.25
30 - 35	5	32.5	162.5	1056.25	5281.25
36 - 41	1	38.5	38.5	1482.25	1482.25
Total	$\sum f = 70$		$\sum fx = 1093.0$		$\sum fx^2 = 22415.5$