Let random variable X have a N(,2) distribution. Find: (i) if 2 = 2 and P(X 12) = 0.72. (ii) 2 if

Let random variable X have a N(μ,σ2) distribution. Find: (i) μ if σ2 = 2 and P(X ≤

12) = 0.72. (ii) σ2 if μ = 2 and P(X ≥5) = 0.39.