A survey of 50 retail stores revealed that the average price of a microwave was $375, with a sample standard deviation of $20. Assuming the population is normally distributed, what is the 95% confidence interval to estimate the true cost of the microwave? Select one: a. $323.40 to $426.60 b. $328.40 to $421.60 c. $350.80 to $395.80 d. $369.31 to $380.69
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