The length of time that it takes to drive a 10-mile stretch of some freeway is normally distributed with a mean of 12 minutes and a standard deviation of 2.7 minutes. What proportion of trips down this 10-mile stretch will take between 17.4 and 20.1 minutes?

suppose ten transit times are recorded: {14.28, 16.54, 17.28, 14.47, 13.68, 12.98, 15.99, 12.24, 11.45, 22.14}

Are there any outliers?

1. (a) No
2. (b) Yes, 11.45
3. (c) Yes, 22.14
4. (d) Yes, 22.14 and 11.45