You Are Conducting a Study on the Blood Glucose Levels $\bar { x }$

Multiple Choice

You are conducting a study on the blood glucose levels of 9 patients who are on strict diets and exercise routines.To monitor the mean and range of the blood glucose levels of your patients, you take a blood glucose reading every day for each patient for 20 days.The mean of the 9 sample means is 101.03, and the mean of the 9 standard deviations is 29.243.The lower control limit for your $\bar { x }$ chart is ________.

A) 70.85
B) 92.11
C) 73
D) 71.75
E) 60.5