Question: Please help with a variance formula. Is this correct: variance = [1^2 *0.2 + 4^2*1.2 + 6^2 *2.4 +8^2 *0.8] - 4.6^2 y f(y) E(y)

Please help with a variance formula. Is this correct:

variance = [1^2 *0.2 + 4^2*1.2 + 6^2 *2.4 +8^2 *0.8] - 4.6^2

y f(y) E(y)
1 0.2 0.2
4 0.3 1.2
6 0.4 2.4
8 0.1 0.8
4.6

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