SOLUTION: Steel rods are manufactured with a mean length of 25 centimeters (cm). Because of the variability in the manufacturing process, the lengths of the rods are approxima

Question 1167460: Steel rods are manufactured with a mean length of 25 centimeters (cm). Because of the variability in the manufacturing process, the lengths of the rods are approximately Normally distributed, with a standard deviation of 0.07 cm.
10% of these rods are longer than what length?
Answer by Boreal(15235) (Show Source): You can put this solution on YOUR website!
they are longer than 1.28, since that is the 90th percentile
z=(x-mean)/sd
1.28=(x-25)/0.07
8.96=x-25
x=33.96 cm is the answer.

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