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A random sample of 40 bags of flour is weighed. It is found that the sample...

A random sample of 40 bags of flour is weighed. It is found that the sample mean is 453.08 grams. All weights of the bags of flour have a population standard deviation of 5.42 grams. What is the lower limit of an 80% confidence interval for the population mean weight?
Select one:
A. 452.405 grams
B. 451.983 grams
C. 452.360 grams
D. No solution

Math   Statistics-And-Probability   
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