A company that makes an exercise machine asked some of its recent customers how long they have owned their machines and how many hours per month they currently use their machines. Which of the following is the best estimate of the average change in hours of exercise per month that was associated with a 1 month increase in ownership?
A.
-5 hours
B.
-3 hours
C.
-3/4 hours
D.
-1/3 hours

(co 3) the soup produced by a company has a salt level that is normally distributed with a mean of 5.4 grams and a standard deviation of 0.3 grams. the company takes readings of every 10th bar off the production line. the reading points are 5.8, 5.9, 4.9, 6.5, 5.0, 4.9, 6.2, 5.1, 5.7, 6.1. is the process in control or out of control and why? it is out of control as two of these data points are more than 2 standard deviations from the mean it is in control as the data points more than 2 standard deviations from the mean are far apart it is out of control as one of these data points is more than 3 standard deviations from the mean it is in control as the values jump above and below the mean