We have collected data on the total number of minutes people spent in the local emergency room revealed that patients spend on average 166.9 minutes in the ER, with a standard deviation of 55.4 minutes. Assume that the times collected follow a normal distribution. What percentage of the ER patient population spent less than 175 minutes there? for credit your work must include a filled out formula for your z-score and show a sketch of the distribution with the correct area shaded.