Left hemisphere:

0.08907489 0.100528634 0.102290749 0.100748899 0.107136564 0.105374449 0.109559471 0.109339207 0.11154185 0.115506608 0.113744493 0.113744493 0.115947137 0.122555066 0.125638767 0.130044053 0.128502203 0.136211454

Right hemisphere: 0.094517766 0.101624365 0.103654822 0.104162437 0.106700508 0.111269036 0.11177665 0.10822335 0.109746193 0.110761421 0.112284264 0.115329949 0.118883249 0.124467005 0.124467005 0.127005076 0.132588832 0.137664975

The mean should be quite easy to calculate as it's just the average of the means of the two groups. However, the problem is how to calculate the standard deviation without knowing which patient the left and right measurements belong to. Is it feasible? If so, how?

Thank you!