1. The graph represents the level of happiness at different times of day. Use the graph to answer the questions below. Note that time is measured from midnight, so "12" is noon. Average Level of Happiness Time of Day, hours since midnight 10 11 13 15 16 17 18 19 20 21 22 12 14 a. At what time is the level of happiness the high- est? What is the level at that time? b. What was the happiness level at 4 p.m.? What other times had the same happiness level? d. During what time interval does the happiness level remain constant? c. At what time(s) was the happiness at level 3?

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