Suppose x is a normally distributed random variable with μ=12 and σ=2. Find each of the following probabilities.   a. ​ P(x≥15.5​)   b. ​ P(x≤11​)   c. ​ P(13.3≤x≤16.8​)   d. ​ P(6.74≤x≤14.8​)

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