Question 10 of 20 Lunch break: In a recent survey of 655 working Americans ages 25-34, the average weekly amount spent on lunch was $46.11 with standard deviation $2.61. The weekly amounts are approximately bell- shaped. (a) Estimate the percentage of aimounts that are between $40.89 and $51.33. (b) Estimate the percentage of amounts that are between $38.28 and $53.94. (c) Between what two values will approximately 68% of the amounts be?