Find the value of and of and calculate P(W > 6.48) for the variable W

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Find the value of μ and of σ and calculate P(W > 6.48) for the variable W ~N(μ, σ2), given that P(W ≥ 4.75) = 0.6858 and P(W ≤ 2.25) = 0.0489.

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