Statistics Probability question, please show steps.

Letxrepresent the dollar amount spent on supermarket impulse buying in a 10-minute (unplanned) shopping interval. Based on a certain article, the mean of thexdistribution is about$36and the estimated standard deviation is about$9.

(b) What is the probability thatxis between$34and$38? (Round your answer to four decimal places.)

(c) Let us assume thatxhas a distribution that is approximately normal. What is the probability thatxis between$34and$38? (Round your answer to four decimal places.)