Standardized z-score is z = (x - 44)/6.5

(a) P(x <= 60) = P(z <= (60-44)/6.5) = P(z <= 2.4615) = 0.9931

(b) P(x >= 50) = P(z >= (50-44)/6.5) = P(z >= -0.9231) = 0.8220

(c) P(50 <= x <= 60) = P(-.09231 <= z <= 2..4615) = 0.8151

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