The Thundering Herd, an amusement park ride, is not open to patrons less than 54" tall. If the mean height of park patrons is 68" with a standard deviation of 12 inches, what percent of the patrons will not be able to use this ride? The z for 54" = - . (The negative means 54" is less than the mean of 68." Do not enter a negative percent.) The percentage for the above z is %. This is the percentage of patrons between 54" and 68". The percentage for ALL patrons above 68" is %. (This corresponds to z = +4.) So the percentage of patrons above 54" is %. Therefore, adding the two together, the percentage of patrons below 54" and who may not use this ride is %.