# Chapter 2 - Set Theory - 2.1 Basic Set Concepts - Exercise Set 2.1: 114

{10,14,16}

#### Work Step by Step

{x| x is a time of the day when the average level of happiness was 1} In the graph we can see that at 10 AM , 14 hour and 16 hour the average level of happiness was 1. So set A = {10,14,16}

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