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The following data represent the amount of leakage of a ?uorescent dye from the bloodstream into the eye in patients with abnormal retinas:

1.6 1.4 1.2 2.2 1.8 1.7
1.8 6.3 2.4 2.3 18.9 22.8

Assuming that these data come from a normal distribution, ?nd the maximum likelihood estimate of (μ, σ).

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