The average credit card debt for college seniors is $3262. If the debt is normally distributed with

Question:

The average credit card debt for college seniors is $3262. If the debt is normally distributed with a standard deviation of $1100, find these probabilities.
a. That the senior owes at least $1000
b. That the senior owes more than $4000
c. That the senior owes between $3000 and $4000