Find the standard deviation for the group of data items. \[ 9,10,11,12,13 \]

To find the standard deviation for the data set 9, 10, 11, 12, 13, follow these steps: 1. Calculate the mean (average):   Mean = (9 + 10 + 11 + 12 + 13) / 5 = 55 / 5 = 11 2. Subtract the mean from each number to find the deviation:   9 - 11 = -2   10 - 11 = -1   11 - 11 = 0   12 - 11 = 1   13 - 11 = 2 3. Square each deviation:   (-2)² = 4   (-1)² = 1   0² = 0   1² = 1   2² = 4 4. Find the variance by averaging these squared differences:   Variance = (4 + 1 + 0 + 1 + 4) / 5 = 10 / 5 = 2 5. Take the square root of the variance to get the standard deviation:   Standard Deviation = √2 ≈ 1.414 Thus, the standard deviation for the group of data items is approximately 1.414.