17. The average amount parents and children spent per child on back-to-school clothes in Autumn 2001 was $527 (CNBC, September 5, 2001). Assume the standard deviation is $160 and that the amount spent is normally distributed.

a. What is the probability that the amount spent on a randomly selected child is more than $700?

b. What is the probability that the amount spent on a randomly selected child is less than $100?

c. What is the probability that the amount spent on a randomly selected child is between $450 and $700?

d. What is the probability that the amount spent on a randomly selected child is no more than $300?