During the past six months, 73.2 percent of US households purchased sugar. Assume that these expenditures are approximately normally distributed with a mean of $8.22 and a standard deviation of $1.10. a) Find the probability that a household spent less than $5.00 on sugar. b) Find the probability that a household spent more than $10.00 on sugar. c) What proportion of the households spent between $5.00 and $9.00 on sugar? d) 99 percent of the households spent less than what amount? e) 80 percent of the households spent more than what amount? f) Calculate the IQR of the household expenditure.