A Major Airline Has Stated in an Industry Report That

A major airline has stated in an industry report that its mean onground time between domestic flights is less than 18 minutes. To test this, the company plans to sample 36 randomly selected flights and use a significance level of 0.10. Assuming that the population standard deviation is known to be 4.0 minutes, the probability that the null hypothesis will be "accepted" if the true population mean is 16 minutes is approximately 0.955.