Hello everyone! I don't know how to find mean of sample means! Here I did only frequency table.Here is the task( in attachment)
In other words, as in the example, "average" the four digits: the average of the digits of the first number, 1665, is (1+ 6+ 6+ 5)/4= 18/4= 4.5. After you have done that for all 18 numbers, average those 18 numbers- add them up and divide by 18.