Answer:
1) Y
2) Y
3) N
4) N
5) N
steps
1) How many bananas did Joe eat yesterday?
The word "many" tells you that its talking about variability.
2) What is the population of Austin, Texas?
The phrase "What is the population..." tells you that its talking about variability.
3) What kind of sandwiches does your class like?
Doesn't talk about variability.
4) What is the name of your teacher?
Doesn't talk about variability.
5) How much do televisions cost?
Doesn't talk about variability.
(YYNNN)