The mean percentage of a population of people eating out at least once a week is 57% with a standard deviation of 3.50%. assume that a sample size of 40 people was surveyed from the population a significant number of times. in which interval will 68% of the sample means occur?
between 55.89% and 58.11%
between 56.45% and 57.55%
between 56.54% and 57.46%
between 56.07% and 57.93%