lenGroup	meanN	meanw	varN	varw
1	260.2	3.2	2653.50	0.20
2	281.7	6.9	1491.40	0.10
3	144.9	12.6	182.50	0.10
4	88.8	27.9	145.90	1.40
5	67.7	49.9	49.50	5.10
6	43.1	75.7	19.50	45.00
7	55.9	109.5	601.40	24.80
8	26.9	158.6	61.20	11.80
9	19.8	196.0	104.20	39.90
10	15.0	260.8	0.20	13.10