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    • weight of each box(X) = 9800 / 49 = 200
    • u = 205
    • sigma = 15
    • n = 49
    • sample_sigma = 15/7 = 2.1428
    • prob(X < 200) = 200-205 / 2.1428 = -2.33
    • z(X < 2.33) = 1 - 0.99010 = 0.0099