The Weight of a Product Is Measured in Pounds

The weight of a product is measured in pounds.A sample of 50 units is taken from a recent production.The sample yielded = 75 lb,and we know that σ² = 100 lb.Calculate a 95 percent confidence interval for μ.

A) [71.25,78.75]
B) [72.23,77.77]
C) [47.28,102.72]
D) [72.67,77.33]