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Steel rods are manufactured with a mean length of 21 centimeter(cm). Because of variability in the manufacturingprocess, the lengths of the rods are approximately normally

Steel rods are manufactured with a mean length of 21 centimeter(cm). Because of variability in the manufacturingprocess, the lengths of the rods are approximately normally distributed with a standard deviation of 0.06 cm.

What proportion of rods has a length less than 20.9 cm?

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