ars of peanuts are being filled on a production line. When the process is in control, the weights of peanuts in the jars follow a normal distribution with mean 454 grams and standard deviation 3 grams. Every hour during an eight-hour shift, a sample of 5 jars is selected and their contents are weighed. The following are the mean weights for each sample of five jars during an eight-hour shift:

455.3457.5451.4457.3452.2450.9458.3457.4

The means are plotted on the followingcontrol chart (with missing control limits). The completed chart would signal that:

Seleccione una:

a.The process is in control. No points fall outside the control limits.

b.The process may be out of control. No points fall above the upper control limit, but one point falls below the lower control limit.

c.The process may be out of control. Several pointsfallboth below the lower control limits and above the upper control limit.

d.The process may be out of control. No points fall below the lower control limit; but one point falls above the upper control limit.

e.The process may be out of control. No points fall below the lower control limit, but several points fall above the upper control limit.