A pizza delivery vendor has a goal of delivering all orders within 50 minutes. A sample was taken and found a mean
of 40 minutes and a sample standard deviation of 6 minutes.
Assuming the distribution is normal, what percent of the population did not meet the goal of 50 minutes?
I think it pertains to the Central Limit Theorem Sampling Normal Distribution
Im not sure about the proper formula. I've been plugging in numbers that make sense and not getting the correct answer, Please Help!