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7 + 4 + 9 + 8 + 2 = 30

So mean = 30/5 = 6

72 + 42 + 92 + 82 + 22 = 214

So variance = 214/5 - 62 = 42.8 - 36 = 6.8

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Q: What is the variance of 7 4 9 8 2?
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