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The bar graph summarizes the charge, in kilowatt-hours , a battery received each day for days.
For how many of these days did the battery receive a charge of ?
Explanation
Choice D is correct. It's given that the bar graph summarizes the charge, in kilowatt-hours , a battery received each day for days. The height of each bar in the bar graph shown represents the number of days the battery received the charge, in , specified at the bottom of the bar. The bar for a charge of reaches a height of . Therefore, the battery received a charge of for of these days.
Choice A is incorrect. This is the charge, in , that the battery received, not the number of days the battery received this charge.
Choice B is incorrect. This is the number of days the battery received a charge of either , , or .
Choice C is incorrect. This is the number of days the battery received a charge of .