Lunch break: In a recent survey of 655 working Americans ages 25-34, the average weekly amount spent on lunch was $45.07, with a standard deviation of $2.87. The weekly amounts are approximately bell-shaped.
Estimate the percentage of amounts that are between $39.33 and $50.81.
Approximately 95% of the amounts fall between $39.33 and $50.81.
Estimate the percentage of amounts that are between $36.46 and $53.68.