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(a)

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From the graph,

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At 6 AM the power consumption is 500 MW.

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At 6 PM the power consumption is 730 MW.

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(b)

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The power consumption was lowest at 4 AM.

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The power consumption was highest at 12 noon.

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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.

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(a) At 6 AM the power consumption is 500 MW and at 6 PM the power consumption is 730 MW.

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(b) The power consumption was lowest at 4 AM and the power consumption was highest at 12 noon.