The mean of the answer is 20.5 because you add all of the number together and divide by 6 because there's 6 numbers.
I'm sorry, but I don't know how to do the standard deviation...
Hope this helped!
Divide 13.20 by 6.
6/13.20 = 1/2.2
1 bowl is $2.20
Then its midpoint = (-2, 3)
The answer is 17/5. First you multiply 5*3=15 then you add 2 which your answer is 17/5.