A Survey of 50 Retail Stores Revealed That the Average

Multiple Choice

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?

A) $323.40 to $426.60
B) $328.40 to $421.60
C) $350.80 to $395.80
D) $369.31 to $380.69