Arandom sample of 85 adults found that the average calorie consumption was 2100 per day. previous research has found a standard deviation of 450 calories, and you use this value for \sigma σ. a researcher wants to estimate a 95% confidence interval and is willing to accept a margin of error of \pm 50 ± 50 calories. she knows it will cost $50 to survey each member of the sample. given this information, how much will it cost to survey the minimum number of people?