The average credit card debt for public school teacher is 14,975. If the debt is normally distributed with a standard deviation of 5,650, ﬁnd the probabilities: (a) that the teacher owes less than...

The average credit card debt for public school teacher is 14,975. If the debt is normally distributed with a standard deviation of 5,650, ﬁnd the probabilities:

(a) that the teacher owes less than 6,740; and

(b) that the teacher owes between 7500 and 19000.