ssig Find a. the mean; b, the deviation from the mean for each data item; and c. the sum of the deviations in part (b) for the following group of data items. 134, 135, 140, 143, 148 a. The mean is (Simplify your answer.) b. Complete the following table by entering the deviations for each data value. Data Item 134 135 140 143 148 Deviation (Simplify your answers.) c. The sum of the deviations is (Simplify your answer.)