(a)
\From the graph,
\At 6 AM the power consumption is 500 MW.
\At 6 PM the power consumption is 730 MW.
\(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.
\(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.