Scrapie is a degenerative disease of the nervous system. A study of the substance IDX as a treatment for scrapie used as subjects 16 infected hamsters. Eight, chosen at random, were injected with IDX. The other 8 were untreated. The researchers recorded how long each hamster lived. They reported: Thus, although all infected control hamsters had died by 94 days after infection (mean SEM=87.91.8), IDX-treated hamsters lived up to 114 days (mean SEM=106.22.62 ). Readers are supposed to know that SEM stands for the standard error of the mean. (a) For the group injected with IDX , find: The mean, x= The standard deviation, s= (b) For the untreated group, find: The mean, x= The standard deviation, s=.