What is the mean absolute deviation of the data set?

{6, 7, 9, 5, 4,11

Ican figure out 20 shares multiply by $117.98 =2359.6920 shares multiply by $124.32=2486.40then take 40 shares multiply by $128.48=5139.20after that i'm lost any be greatly appreciated.

I'll give brainliest if you answer right : )

Calculate the missing value. round the answer to on decimal place. start with 70, increase it by 21%, and end up with