Find the standard deviation for the indicated sets of numbers. A calculator may be used.

The number of apps in Exercise

Data from Exercises 19 

Use the following data. In a random sample, 30 Android users were asked to record the number of apps that were installed on their phone. The resulting data are shown below:

Make a stem-and-leaf plot of these data (without split stems).

112, 91, 101, 85, 76, 115, 93, 126, 78, 86, 105, 107, 58, 86, 109, 111, 103, 105, 97, 110, 92, 95, 107, 89, 101, 67, 103, 99, 93, 82