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Multiple choice
A qubit measures 0 with probability 1/3 and 1 with probability 2/3 (outcome X = 0 or 1). What is the variance of X?
1/3 ≈ 0.33
4/9 ≈ 0.44
2/3 ≈ 0.67
2/9 ≈ 0.22
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