The following are the results on an assay measuring T levels in saliva samples from 25 middle school children who are also completing a survey on tobacco use.

7 50 15 10 0 14 20 12 8 16 19 20 12 10 15 20 6 9 033 14 18 17 32 30

1. Calculate the mean, median, and range (Show your work)
2. We assume the T levels in saliva follows a normal distribution with mean 15.4 and standard deviation of 10.5.

Find the probabilities for the following:

1. Probability of all T levels that are less than 17
2. Probability of all T levels that are greater than 9
3. Probability of all Levels that between 9 and 11