Here you can calculate the mean, median, and standard deviation for a series of numbers.
You can enter your data one by one into the little window labeled "Enter a single data value here." They will appear in the large data window after you hit "Enter". You can also enter the data directly into the large data window. (Use space bar to separate the data. The applet doesn't accept commas) You can also edit them there just like in a word-processor. Click "Recalculate!" to get the mean, median and standard deviation of the numbers as listed in the large window at that time.