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The inner diameter of a piston is normally distributed with mean of 10 cm and standard deviation 0.03cm

a)below what value of inner diameter will fall fifteen percent of the piston rings?

  • Math -

    Z = (score-mean)/SD

    Find table in the back of your statistics text labeled something like "areas under normal distribution" to find the proportion/probability (.15) related to a Z score. Insert the values into the above equation.

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