based on a survey conducted by greenfield online, 25-34 year olds spend the most each week on fast food. The average weekly amount of $44 was reported in may 2009 USA Today Snapshot. Assuming that weekly fast food expenditures are normally distributed with a standard deviation of $14.50, what is the probability that a 25- 34 year old will spend between $30 and $50 a week? and that theyll spend more than $75 a week on fast food?