help me answe this question

Question

A process is normally distributed with a mean of 104 rotations per minute and a standard deviation of 8.2 rotations per minute. If a randomly selected minute has 80 rotations per minute, would the process be considered in control or out of control?
Out of control as this one data point is more than two standard deviations from the mean
In control as this one data point is not more than three standard deviations from the mean
In control as only one data point would be outside the allowable range
Out of control as this one data point is more than three standard deviations from the mean

Answer 1

z = (80 - 104) / 8.2

z = (-24) / 8.2

z = -2.926829268