Answer:
see below
Step-by-step explanation:
A
Add the students who passed french, german, both
add 17+19+11 = 47
Subtract this from 55 to get b
b = 55-47 =8
b =8
B
P( passed french and german)
  = number that passed french and german / total
  = 19/55
P( french or german) =
 = number that passed french or german / total
  = (17+11)/55 =28/55