Whoa there, Nellie!!
No one wants to do your homework for you.
Let's see your attempts at solutions.
Find the mean, median interval, mode, spread, and average spread.
Do not round any of your answers.
15, 11, 7, 15, 10, 7, 10, 10, 10, 7, 10, 12, 11, 11, 8, 12, 8, 12, 12, 6
mean = ?
median = ?
mode = ?
spread = ?
average spread = ?
How to get mean and spread has been explained in response to other questions you have posted. You have been asked in another post to define average spread.
As for the median and the mode, I suggest you go back and review the definition of each of these statistics in your classnotes and/or textbook. Then, if you still need help, please be specific about what you don't understand.