It isn't. The time spent would be but the keyword here is "number". Therefore, the number of hours would be an whole number, hence it would be discrete data.
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If you are paid on an hourly rate, the number of hours that you work and your pay will be in direct variation.
You divide the number of miles traveled by the number of hours and the result - the constant of variation - is 3.66 (recurring) miles per hour.
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To determine how many students practiced the piano for more than 3 hours a week, you would need to analyze the data presented in the plot graph. Look for the section of the graph that represents practice times exceeding 3 hours and count the number of students indicated in that range. The total from that segment will give you the answer. If you have the graph, you can visually identify and count those students directly.
Divide the number of hours by 24.