![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
(a)
From the graph,
At 6 AM the power consumption is 500 MW.
At 6 PM the power consumption is 730 MW.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step2.JPG\")
(b)
The power consumption was lowest at 4 AM.
The power consumption was highest at 12 noon.
Yes, it is reasonable at 4 AM the majority of the population is in still asleep and at 12 noon majority of the people were awake and that time the people uses more electricity.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")
(a) At 6 AM the power consumption is 500 MW and at 6 PM the power consumption is 730 MW.
(b) The power consumption was lowest at 4 AM and the power consumption was highest at 12 noon.