Which of the four sets of data represents a normal distribution? O (1, 2, 3, 3, 3, 2, 1) {-10, -8, -8, -6, -6, -6, -4, -4, -2} O (1, 1, 1, 1, 11, 1, 3} O {2, 2, 4, 5, 6, 3, 2, 1}

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