Lunch break: In a recent survey of 655 working Americans ages 25 34, the average weekly amount spent on lunch was $44.58 with standard deviation $2.90. The weekly amounts are approximately bellshaped. (a) Estimate the percentage of amounts that are between $38.78 and $50.38. (Choose one) V of the amounts fall between $38.78 and $50.38. (c) Between what two values will approximately 68% of the amounts be? Approximately 68% of the amounts fall between $E] and $[:]