Here’s a riddle to help out
Hey diddle diddle the median is in the middle. Add and divide for the mean. The mode is the one that appears the most. And the range is the distance between.
The mean is the average of it. You would add up all the numbers and divide the numbers of number.
Example:
3,5,7,3,2,9
All those = 29
There are 6 numbers.
So you would do 29/6 which equals 4.83. That’s the mean.
I hoped I helped. I’m not well on stem and leaf plots.