In a random sample of 40refrigerators, the mean repair cost was $121.00and the population standard deviation is $15.80. Construct a 90%confidence interval for the population mean repair cost. Interpret the results.

Construct a 90%confidence interval for the population mean repair cost.

The 90%confidence interval is__,___?

Interpret you results. Choose the correct answer below. A.The confidence interval contains 90% of the mean repair costs.B.With 90% confidence, it can be said that the confidence interval contains the sample mean repair cost.C.With 90% confidence, it can be said that the confidence interval contains the true mean repair cost.