The number of types of cereal in the pantries of six households is 6, 11, 3, 5,

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The number of types of cereal in the pantries of six households is 6, 11, 3, 5, 6, and 2, respectively.
Let x be the number of types of cereal in the pantry of a household. Find:
a. ∑x
b. (∑x)2
c. ∑x2
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