sample	obs1	obs2	obs3	obs4	mean	stdev
1	234.5	272.3	234.5	272.3	253.4	21.8
2	311.1	305.8	238.5	286.2	285.4	33
3	247.1	205.3	252.6	316.1	255.3	45.7
4	215.4	296.8	274.2	256.8	260.8	34.4
5	327.9	247.2	283.3	232.6	272.7	42.5
6	304.3	236.3	201.8	238.5	245.2	42.8
7	268.9	276.2	275.6	240.2	265.2	17
8	282.1	247.7	259.8	272.8	265.6	15
9	260.8	259.9	247.9	345.3	278.5	44.9
10	329.3	231.8	307.2	273.4	285.4	42.5
11	266.4	249.7	231.5	265.2	253.2	16.3
12	168.8	330.9	333.6	318.3	287.9	79.7
13	349.9	334.2	292.3	301.5	319.5	27.1
14	235.2	283.1	245.9	263.1	256.8	21
15	257.3	218.4	296.2	275.2	261.8	33
16	235.1	252.7	300.6	297.6	271.5	32.7
17	286.3	293.8	236.2	275.3	272.9	25.6
18	328.1	272.6	329.7	260.1	297.6	36.5
19	316.4	287.4	373	286	315.7	40.7
20	296.8	350.5	280.6	259.8	296.9	38.8