Ten patients with high blood pressure participated in a study to evaluate the effectiveness of the drug Timolol in reducing their blood pressure. The accompanying table shows systolic blood pressure measurements taken before and after 2 weeks of treatment with Timolol. Calculate the mean and SD of the change in blood pressure (note that some values are negative).

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Blood pressure (mm HG) Patient Before After Change 1172 159 2 186 157 29 3 170 163 4 205 207 5 174 164-10 6 184 443 7 178 182 8 156 171 9 190 177 10 168 138 -13 15 -13 -30