An expert has found that his patients, on the average, complete a treatment after 10 sessions. If the number of sessions required to complete the treatment are approximately normally distributed with a standard deviation of 2, find: 1. Proportion of patients completing the treatment in less than 7 sessions. 2. The proportion of patients that will require between 8 and 13 sessions in order to complete the treatment. 3. If the expert has 250 patients in his hospital and anyone that completes the treatment in more than 16 sessions will need additional treatment, then what is the proportion and the total number of patients that have to attend such additional treatment? 4. What is the number of sessions needed to complete the treatment that would represent the 1st quartile (25th percentile)?
